| sibilant | (adjective) of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') | Synonyms: continuant, fricative, spirant, strident |
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| sibyllic | (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibylline, vatic, vatical |
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| sibylline | (adjective) having a secret or hidden meaning | Synonyms: cabalistic, cryptic, cryptical, kabbalistic, qabalistic |
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| (adjective) resembling or characteristic of a prophet or prophecy | Synonyms: divinatory, mantic, sibyllic, vatic, vatical |
| sick | (adjective) affected by an impairment of normal physical or mental function | Synonyms: ill |
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| (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grim, grisly, gruesome, macabre |
| (adjective) having a strong distaste from surfeit | Synonyms: disgusted, fed up, sick of, tired of |
| (adjective) affected with madness or insanity | Synonyms: brainsick, crazy, demented, disturbed, mad, unbalanced, unhinged |
| (adjective) deeply affected by a strong feeling | - |
| (adjective) (of light) lacking in intensity or brightness; dim or feeble | Synonyms: pale, pallid, wan |
| (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sickish |
| sickening | (adjective) causing or able to cause nausea | Synonyms: loathsome, nauseating, nauseous, noisome, offensive, queasy, vile |
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| sickish | (adjective) feeling nausea; feeling about to vomit | Synonyms: nauseated, nauseous, queasy, sick |
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| sickly | (adjective) somewhat ill or prone to illness | Synonyms: ailing, indisposed, peaked, poorly, seedy, under the weather, unwell |
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| (adjective) unhealthy looking | Synonyms: sallow |
| side | (adjective) located on a side | - |
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| sidearm | (adjective) (of pitches) made with the arm moving parallel to the ground | - |
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| sidelong | (adjective) inclining or directed to one side | - |
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| (adjective) (used especially of glances) directed to one side with or as if with doubt or suspicion or envy | Synonyms: askance, askant, asquint, squint-eyed, squint, squinty |
| (adjective) situated at or extending to the side | Synonyms: lateral |
| sidereal | (adjective) (of divisions of time) determined by daily motion of the stars | - |
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| (adjective) of or relating to the stars or constellations | - |
| sidesplitting | (adjective) very funny | Synonyms: killing |
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| sideways | (adjective) (of movement) at an angle | Synonyms: crabwise |
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| sighted | (adjective) able to see | - |
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| sightless | (adjective) lacking sight | Synonyms: eyeless, unseeing |
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| sightly | (adjective) very pleasing to the eye | Synonyms: bonnie, bonny, comely, fair |
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| sigmoid | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoidal |
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| (adjective) curved in two directions (like the letter S) | - |
| sigmoidal | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoid |
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| sign | (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, signed |
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| signal | (adjective) notably out of the ordinary | - |
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| signed | (adjective) having a handwritten signature | - |
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| (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, sign |
| significant | (adjective) important in effect or meaning | Synonyms: important |
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| (adjective) too closely correlated to be attributed to chance and therefore indicating a systematic relation | - |
| (adjective) of considerable importance, size, or worth | Synonyms: substantial |
| (adjective) rich in significance or implication | Synonyms: meaning, pregnant |
| significative | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, suggestive |
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| silenced | (adjective) reduced to silence | - |
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| silent | (adjective) implied by or inferred from actions or statements | Synonyms: tacit, understood |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: dumb, mute |
| (adjective) having a frequency below or above the range of human audibility | - |
| (adjective) marked by absence of sound | Synonyms: soundless, still |
| (adjective) failing to speak or communicate etc when expected to | Synonyms: mum |
| (adjective) not made to sound | Synonyms: unsounded |
| (adjective) expressed without speech | Synonyms: mute, tongueless, unspoken, wordless |
| siliceous | (adjective) relating to or containing or resembling silica | Synonyms: silicious |
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| silicious | (adjective) relating to or containing or resembling silica | Synonyms: siliceous |
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| silken | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silklike, silky, sleek, slick |
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| silklike | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silken, silky, sleek, slick |
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| silky | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silken, silklike, sleek, slick |
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| silly | (adjective) dazed from or as if from repeated blows | Synonyms: punch-drunk, slaphappy |
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| (adjective) ludicrous, foolish | Synonyms: goofy, wacky, whacky, zany |
| (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded |
| (adjective) inspiring scornful pity | Synonyms: pathetic, ridiculous |
| silty | (adjective) full of silt | - |
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| silvan | (adjective) relating to or characteristic of wooded regions | Synonyms: sylvan |
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| silver | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: argent, silverish, silvery |
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| (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, facile, fluent, silver-tongued, smooth-spoken |
| (adjective) having the white lustrous sheen of silver | Synonyms: silvern, silvery |
| (adjective) made from or largely consisting of silver | - |
| silverish | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: argent, silver, silvery |
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| silvern | (adjective) having the white lustrous sheen of silver | Synonyms: silver, silvery |
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| (adjective) resembling or reminiscent of silver | Synonyms: silvery |
| 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 |
| simian | (adjective) relating to or resembling an ape | - |
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| 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 | - |
| 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 |
| 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 | - |
| simplistic | (adjective) characterized by extreme and often misleading simplicity | - |
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| 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 | - |
| simultaneous | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coincidental, coinciding, concurrent, cooccurring |
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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 |
| 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 |
| singable | (adjective) suitable for singing | - |
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| singing | (adjective) smooth and flowing | Synonyms: cantabile |
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| 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 |
| singsong | (adjective) uttered in a monotonous cadence or rhythm as in chanting | Synonyms: chantlike, intoned |
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| 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 |
| 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 | - |
| 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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| sinkable | (adjective) capable of being sunk | - |
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| sinless | (adjective) free from sin | Synonyms: impeccant, innocent |
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| sinning | (adjective) transgressing a moral or divine law | - |
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| sintered | (adjective) formed into a mass by heat and pressure | - |
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| sinuate | (adjective) curved or curving in and out | Synonyms: sinuous, wiggly |
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| (adjective) having a strongly waved margin alternately concave and convex | - |
| sinuous | (adjective) curved or curving in and out | Synonyms: sinuate, wiggly |
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| (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lissome, lithe, lithesome, supple |
| sinusoidal | (adjective) having a succession of waves or curves | - |
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| sissified | (adjective) having unsuitable feminine qualities | Synonyms: cissy, effeminate, emasculate, epicene, sissy, sissyish |
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| sissy | (adjective) having unsuitable feminine qualities | Synonyms: cissy, effeminate, emasculate, epicene, sissified, sissyish |
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| sissyish | (adjective) having unsuitable feminine qualities | Synonyms: cissy, effeminate, emasculate, epicene, sissified, sissy |
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| sisterlike | (adjective) like or characteristic of or befitting a sister | Synonyms: sisterly, sororal |
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| sisterly | (adjective) like or characteristic of or befitting a sister | Synonyms: sisterlike, sororal |
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| sitting | (adjective) (of persons) having the torso erect and legs bent with the body supported on the buttocks | Synonyms: seated |
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| (adjective) not moving and therefore easy to attack | - |
| situated | (adjective) situated in a particular spot or position | Synonyms: located, placed, set |
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| six | (adjective) denoting a quantity consisting of six items or units | Synonyms: 6, half-dozen, half dozen, vi |
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| sixfold | (adjective) having six units or components | Synonyms: sextuple, six-fold |
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| sixpenny | (adjective) of trifling worth | Synonyms: threepenny, tuppeny, two-a-penny, twopenny-halfpenny, twopenny |
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| sixteen | (adjective) being one more than fifteen | Synonyms: 16, xvi |
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| sixteenth | (adjective) coming next after the fifteenth in position | Synonyms: 16th |
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| sixth | (adjective) coming next after the fifth and just before the seventh in position | Synonyms: 6th |
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| sixtieth | (adjective) the ordinal number of sixty in counting order | Synonyms: 60th |
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| sixty | (adjective) being ten more than fifty | Synonyms: 60, lx, threescore |
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| sizable | (adjective) large in amount or extent or degree | Synonyms: goodish, goodly, healthy, hefty, respectable, sizeable, tidy |
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| (adjective) fairly large in size | Synonyms: ample, sizeable |
| size | (adjective) (used in combination) sized | - |
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| sizeable | (adjective) large in amount or extent or degree | Synonyms: goodish, goodly, healthy, hefty, respectable, sizable, tidy |
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| (adjective) fairly large in size | Synonyms: ample, sizable |
| sized | (adjective) having a specified size | - |
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| (adjective) having the surface treated or coated with sizing | - |
| sizzling | (adjective) hot enough to burn with or as if with a hissing sound | - |
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| (adjective) characterized by intense emotion or interest or excitement | Synonyms: red-hot |