| silverspot | (noun) butterfly with silver spots on the underside of the hind wings | - |
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| silversword | (noun) low-growing plant found only in volcanic craters on Hawaii having rosettes of narrow pointed silver-green leaves and clusters of profuse red-purple flowers on a tall stem | Synonyms: Argyroxiphium sandwicense |
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| silvertip | (noun) powerful brownish-yellow bear of the uplands of western North America | Synonyms: grizzly, grizzly bear, silver-tip, Ursus arctos horribilis, Ursus horribilis |
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| silvervine | (noun) ornamental vine of eastern Asia having yellow edible fruit and leaves with silver-white markings | Synonyms: Actinidia polygama, silver vine |
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| silverware | (noun) tableware made of silver or silver plate or pewter or stainless steel | - |
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| silverweed | (noun) any of various twining shrubs of the genus Argyreia having silvery leaves and showy purple flowers | - |
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| (noun) low-growing perennial having leaves silvery beneath; northern United States, Europe, Asia | Synonyms: goose-tansy, goose grass, Potentilla anserina |
| silverwork | (noun) decorative work made of silver | - |
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| silverworker | (noun) someone who makes or repairs articles of silver | Synonyms: silver-worker, silversmith |
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| silvery | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: argent, silver, silverish |
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| (adjective) having the white lustrous sheen of silver | Synonyms: silver, silvern |
| (adjective) resembling or reminiscent of silver | Synonyms: silvern |
| silvex | (noun) a herbicide that is effective in controlling woody plants but is toxic to animals | - |
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| silviculture | (noun) the branch of forestry dealing with the development and care of forests | - |
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| sima | (noun) rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium | - |
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| simal | (noun) East Indian silk cotton tree yielding fibers inferior to kapok | Synonyms: Bombax ceiba, Bombax malabarica, red silk-cotton tree |
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| simarre | (noun) a fur-lined coat decorated with braid, worn in the sixteenth century. | Synonyms: chamarre, chimer |
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| simazine | (noun) a herbicide used to control weeds (especially among crops) | - |
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| simian | (adjective) relating to or resembling an ape | - |
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| (noun) an ape or monkey | - |
| similar | (adjective) marked by correspondence or resemblance | - |
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| (adjective) resembling or similar; having the same or some of the same characteristics; often used in combination | Synonyms: like |
| (adjective) having the same or similar characteristics | Synonyms: alike, like |
| (adjective) capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability | Synonyms: exchangeable, interchangeable, standardised, standardized |
| (adjective) (of words) expressing closely related meanings | - |
| similarity | (noun) the quality of being similar | - |
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| (noun) a Gestalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit | Synonyms: law of similarity |
| similarly | (adverb) in like or similar manner | Synonyms: likewise |
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| simile | (noun) a figure of speech that expresses a resemblance between things of different kinds (usually formed with `like' or `as') | - |
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| similitude | (noun) a duplicate copy | Synonyms: counterpart, twin |
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| (noun) similarity in appearance or character or nature between persons or things | Synonyms: alikeness, likeness |
| simmer | (noun) temperature just below the boiling point | - |
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| (verb) boil slowly at low temperature | - |
| simmering | (noun) cooking in a liquid that has been brought to a boil | Synonyms: boiling, stewing |
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| simmpleness | (noun) absence of affectation or pretense | Synonyms: simplicity |
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| simnel | (noun) a crisp bread of fine white flour | - |
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| (noun) a fruitcake (sometimes covered with almond paste) eaten at mid-Lent or Easter or Christmas | - |
| simoleons | (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, kale, lettuce, lolly, loot, lucre, moolah, pelf, scratch, shekels, sugar, wampum |
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| simony | (noun) traffic in ecclesiastical offices or preferments | Synonyms: barratry |
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| simoom | (noun) a violent hot sand-laden wind on the deserts of Arabia and North Africa | Synonyms: samiel, simoon |
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| simoon | (noun) a violent hot sand-laden wind on the deserts of Arabia and North Africa | Synonyms: samiel, simoom |
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| simper | (noun) a silly self-conscious smile | - |
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| (verb) smile affectedly or derisively | Synonyms: smirk |
| simperer | (noun) a smiler whose smile is silly and self-conscious and sometimes coy | - |
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| simperingly | (adverb) with a lack of courage and determination | Synonyms: pusillanimously |
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| simple | (adjective) (botany) of leaf shapes; of leaves having no divisions or subdivisions | Synonyms: unsubdivided |
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| (adjective) having few parts; not complex or complicated or involved | - |
| (adjective) easy and not involved or complicated | Synonyms: elementary, uncomplicated, unproblematic |
| (adjective) exhibiting childlike simplicity and credulity | Synonyms: childlike, dewy-eyed, round-eyed, wide-eyed |
| (adjective) unornamented | - |
| (adjective) lacking mental capacity and subtlety | Synonyms: dim-witted, simple-minded |
| (adjective) apart from anything else; without additions or modifications | Synonyms: bare, mere |
| (noun) a person lacking intelligence or common sense | Synonyms: simpleton |
| (noun) any herbaceous plant having medicinal properties | - |
| simpleness | (noun) the quality of being simple or uncompounded | Synonyms: simplicity |
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| (noun) lack of ornamentation | Synonyms: chasteness, restraint, simplicity |
| (noun) freedom from difficulty or hardship or effort | Synonyms: ease, easiness, simplicity |
| (noun) a lack of penetration or subtlety | Synonyms: simple mindedness, simplicity |
| simpleton | (noun) a person lacking intelligence or common sense | Synonyms: simple |
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| simplex | (adjective) having only one part or element | - |
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| (adjective) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time | - |
| simplicity | (noun) freedom from difficulty or hardship or effort | Synonyms: ease, easiness, simpleness |
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| (noun) lack of ornamentation | Synonyms: chasteness, restraint, simpleness |
| (noun) the quality of being simple or uncompounded | Synonyms: simpleness |
| (noun) absence of affectation or pretense | Synonyms: simmpleness |
| (noun) a lack of penetration or subtlety | Synonyms: simple mindedness, simpleness |
| simplification | (noun) elimination of superfluous details | - |
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| (noun) the act of reducing complexity | Synonyms: reduction |
| (noun) an explanation that omits superfluous details and reduces complexity | - |
| simplify | (verb) make simpler or easier or reduce in complexity or extent | - |
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| simplism | (noun) an act of excessive simplification; the act of making something seem simpler than it really is | Synonyms: oversimplification |
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| (noun) an explanation that simplifies too far to the point of misrepresentation | Synonyms: oversimplification |
| simplistic | (adjective) characterized by extreme and often misleading simplicity | - |
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| simply | (adverb) and nothing more | Synonyms: but, just, merely, only |
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| (adverb) in a simple manner; without extravagance or embellishment | Synonyms: plainly |
| (adverb) absolutely; altogether; really | - |
| (adverb) (used for emphasis) absolutely | Synonyms: just |
| simulacrum | (noun) a representation of a person (especially in the form of sculpture) | Synonyms: effigy, image |
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| (noun) an insubstantial or vague semblance | - |
| simulate | (verb) make a pretence of | Synonyms: assume, feign, sham |
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| (verb) create a representation or simulation of | Synonyms: model |
| (verb) reproduce someone's behavior or looks | Synonyms: copy, imitate |
| simulated | (adjective) not genuine or real; being an imitation of the genuine article | Synonyms: fake, false, faux, imitation |
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| (adjective) reproduced or made to resemble; imitative in character | - |
| simulation | (noun) the act of giving a false appearance | Synonyms: feigning, pretence, pretending, pretense |
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| (noun) the act of imitating the behavior of some situation or some process by means of something suitably analogous (especially for the purpose of study or personnel training) | - |
| (noun) representation of something (sometimes on a smaller scale) | Synonyms: model |
| (noun) (computer science) the technique of representing the real world by a computer program | Synonyms: computer simulation |
| simulator | (noun) a machine that simulates an environment for the purpose of training or research | - |
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| simulcast | (noun) a broadcast that is carried simultaneously by radio and television (or by FM and AM radio) | - |
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| simultaneity | (noun) happening or existing or done at the same time | Synonyms: simultaneousness |
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| simultaneous | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coincidental, coinciding, concurrent, cooccurring |
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| simultaneously | (adverb) at the same instant | Synonyms: at the same time |
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| simultaneousness | (noun) happening or existing or done at the same time | Synonyms: simultaneity |
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| simvastatin | (noun) an oral lipid-lowering medicine (trade name Zocor) administered to reduce blood cholesterol levels; recommended after heart attacks | Synonyms: Zocor |
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| sin | (noun) an act that is regarded by theologians as a transgression of God's will | Synonyms: sinning |
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| (noun) estrangement from god | Synonyms: sinfulness, wickedness |
| (noun) the 21st letter of the Hebrew alphabet | - |
| (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sine |
| (verb) commit a sin; violate a law of God or a moral law | Synonyms: transgress, trespass |
| (verb) commit a faux pas or a fault or make a serious mistake | Synonyms: blunder, boob, drop the ball, goof |
| sinapism | (noun) a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient | Synonyms: mustard plaster |
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| sincere | (adjective) open and genuine; not deceitful | - |
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| (adjective) characterized by a firm and humorless belief in the validity of your opinions | Synonyms: earnest, solemn |
| sincerely | (adverb) with sincerity; without pretense | Synonyms: truly, unfeignedly |
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| (adverb) written formula for ending a letter | Synonyms: sincerely yours |
| sincerity | (noun) the quality of being open and truthful; not deceitful or hypocritical | - |
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| (noun) the trait of being serious | Synonyms: earnestness, serious-mindedness, seriousness |
| (noun) a quality of naturalness and simplicity | Synonyms: unassumingness |
| (noun) an earnest and sincere feeling | Synonyms: earnestness, seriousness |
| sinciput | (noun) the front part of the head or skull (including the forehead) | - |
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| sine | (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sin |
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| sinecure | (noun) an office that involves minimal duties | - |
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| (noun) a benefice to which no spiritual or pastoral duties are attached | - |
| sinew | (noun) possessing muscular strength | Synonyms: brawn, brawniness, heftiness, muscle, muscularity |
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| (noun) a cord or band of inelastic tissue connecting a muscle with its bony attachment | Synonyms: tendon |
| sinewy | (adjective) consisting of tendons or resembling a tendon | Synonyms: tendinous |
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| (adjective) (of a person) possessing physical strength and weight; rugged and powerful | Synonyms: brawny, hefty, muscular, powerful |
| (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: fibrous, stringy, unchewable |
| sinful | (adjective) far more than usual or expected | Synonyms: extraordinary, over-the-top |
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| (adjective) having committed unrighteous acts | Synonyms: unholy, wicked |
| (adjective) characterized by iniquity; wicked because it is believed to be a sin | Synonyms: iniquitous, ungodly |
| sinfulness | (noun) estrangement from god | Synonyms: sin, wickedness |
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| sing | (verb) make a whining, ringing, or whistling sound | Synonyms: whistle |
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| (verb) divulge confidential information or secrets | Synonyms: babble, babble out, blab, blab out, let the cat out of the bag, peach, spill the beans, talk, tattle |
| (verb) to make melodious sounds | - |
| (verb) produce tones with the voice | - |
| (verb) deliver by singing | - |
| singable | (adjective) suitable for singing | - |
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| singalong | (noun) informal group singing of popular songs | Synonyms: singsong |
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| singe | (noun) a surface burn | Synonyms: scorch |
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| (verb) burn superficially or lightly | Synonyms: swinge |
| (verb) become superficially burned | Synonyms: scorch, sear |
| singer | (noun) a person who sings | Synonyms: vocaliser, vocalist, vocalizer |
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| singing | (adjective) smooth and flowing | Synonyms: cantabile |
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| (noun) the act of singing vocal music | Synonyms: vocalizing |
| (noun) disclosing information or giving evidence about another | Synonyms: tattle, telling |
| single | (adjective) being or characteristic of a single thing or person | Synonyms: individual |
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| (adjective) not married or related to the unmarried state | Synonyms: unmarried |
| (adjective) used of flowers having usually only one row or whorl of petals | - |
| (adjective) existing alone or consisting of one entity or part or aspect or individual | - |
| (adjective) not divided among or brought to bear on more than one object or objective | Synonyms: exclusive, undivided |
| (adjective) having uniform application | - |
| (adjective) characteristic of or meant for a single person or thing | Synonyms: individual |
| (noun) a base hit on which the batter stops safely at first base | Synonyms: bingle |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, one, unity |
| (verb) hit a single | - |
| singleness | (noun) the quality of concentrating on one central objective | - |
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| (noun) without hypocrisy | Synonyms: straightforwardness |
| singles | (noun) tennis played with one person on each side | - |
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| (noun) badminton played with one person on each side | - |
| singlestick | (noun) a stick used instead of a sword for fencing | Synonyms: backsword, fencing stick |
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| singlet | (noun) a collarless men's undergarment for the upper part of the body | Synonyms: undershirt, vest |
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| singleton | (noun) the playing card that is the only card in a suit held in a bridge hand as initially dealt | - |
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| (noun) a set containing a single member | - |
| (noun) a single object (as distinguished from a pair) | - |
| singly | (adverb) one by one; one at a time | - |
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| (adverb) apart from others | Synonyms: individually, on an individual basis, one by one, separately, severally |
| singsong | (adjective) uttered in a monotonous cadence or rhythm as in chanting | Synonyms: chantlike, intoned |
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| (noun) informal group singing of popular songs | Synonyms: singalong |
| (noun) a regular and monotonous rising and falling intonation | - |
| (verb) speak, chant, or declaim in a singsong | - |
| (verb) move as if accompanied by a singsong | - |
| singular | (adjective) grammatical number category referring to a single item or unit | - |
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| (adjective) composed of one member, set, or kind | - |
| (adjective) unusual or striking | Synonyms: remarkable |
| (adjective) being a single and separate person or thing | - |
| (adjective) the single one of its kind | Synonyms: unique |
| (adjective) beyond or deviating from the usual or expected | Synonyms: curious, funny, odd, peculiar, queer, rum, rummy |
| (noun) the form of a word that is used to denote a singleton | Synonyms: singular form |
| singularise | (verb) distinguish as singular | Synonyms: singularize |
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| singularity | (noun) the quality of being one of a kind | Synonyms: uniqueness |
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| (noun) strangeness by virtue of being remarkable or unusual | - |
| singularize | (verb) distinguish as singular | Synonyms: singularise |
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| singularly | (adverb) in a singular manner or to a singular degree | - |
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| singultus | (noun) (usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion | Synonyms: hiccough, hiccup |
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| sinister | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, ominous, threatening |
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| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: black, dark |
| (adjective) on or starting from the wearer's left | - |
| sinistral | (adjective) of or on the left | - |
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| (adjective) preferring to use left foot or hand or eye | - |
| sinistrality | (noun) preference for using the left hand | Synonyms: left-handedness |
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| sinistrorsal | (adjective) spiraling upward from right to left | Synonyms: sinistrorse |
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| sinistrorse | (adjective) spiraling upward from right to left | Synonyms: sinistrorsal |
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| sink | (noun) plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe | - |
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| (noun) a covered cistern; waste water and sewage flow into it | Synonyms: cesspit, cesspool, sump |
| (noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | Synonyms: sinkhole, swallow hole |
| (noun) (technology) a process that acts to absorb or remove energy or a substance from a system | - |
| (verb) fall heavily or suddenly; decline markedly | Synonyms: fall off, slump |
| (verb) embed deeply | Synonyms: bury |
| (verb) go under | Synonyms: go down, go under, settle |
| (verb) fall or descend to a lower place or level | Synonyms: drop, drop down |
| (verb) cause to sink | - |
| (verb) fall or sink heavily | Synonyms: slide down, slump |
| (verb) appear to move downward | Synonyms: dip |
| (verb) descend into or as if into some soft substance or place | Synonyms: subside |
| (verb) pass into a specified state or condition; sink into | Synonyms: lapse, pass |
| sinkable | (adjective) capable of being sunk | - |
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| sinker | (noun) a pitch that curves downward rapidly as it approaches the plate | - |
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| (noun) a weight that sinks (as to hold nets or fishing lines under water) | - |
| (noun) a small ring-shaped friedcake | Synonyms: donut, doughnut |
| sinkhole | (noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | Synonyms: sink, swallow hole |
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| sinking | (noun) a descent as through liquid (especially through water) | - |
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| (noun) a slow fall or decline (as for lack of strength) | - |
| (noun) a feeling caused by uneasiness or apprehension | Synonyms: sinking feeling |
| sinless | (adjective) free from sin | Synonyms: impeccant, innocent |
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| sinlessness | (noun) the state of being unsullied by sin or moral wrong; lacking a knowledge of evil | Synonyms: innocence, pureness, purity, whiteness |
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| sinner | (noun) a person who sins (without repenting) | Synonyms: evildoer |
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| sinning | (adjective) transgressing a moral or divine law | - |
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| (noun) an act that is regarded by theologians as a transgression of God's will | Synonyms: sin |
| sinoper | (noun) a red ocher formerly used as a pigment | Synonyms: sinopia, sinopis |
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