| sorcerous | (adjective) possessing or using or characteristic of or appropriate to supernatural powers | Synonyms: charming, magic, magical, witching, wizard, wizardly |
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| spacious | (adjective) (of buildings and rooms) having ample space | Synonyms: roomy |
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| (adjective) very large in expanse or scope | Synonyms: broad, wide |
| specious | (adjective) plausible but false | Synonyms: spurious |
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| (adjective) based on pretense; deceptively pleasing | Synonyms: gilded, glossy, meretricious |
| spermous | (adjective) consisting of or resembling spermatozoa | Synonyms: spermatic |
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| spinous | (adjective) having spines | Synonyms: spiny |
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| (adjective) shaped like a spine or thorn | Synonyms: acanthoid, acanthous |
| spiritous | (adjective) containing or of the nature of alcohol | Synonyms: spirituous |
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| spirituous | (adjective) containing or of the nature of alcohol | Synonyms: spiritous |
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| splendiferous | (adjective) having great beauty and splendor | Synonyms: glorious, resplendent, splendid |
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| spontaneous | (adjective) happening or arising without apparent external cause | Synonyms: self-generated |
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| (adjective) said or done without having been planned or written in advance | Synonyms: ad-lib, unwritten |
| sporogenous | (adjective) producing spores or reproducing by means of spores | - |
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| spurious | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, unauthentic |
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| (adjective) plausible but false | Synonyms: specious |
| (adjective) born out of wedlock | Synonyms: bastardly, misbegot, misbegotten |
| (adjective) ostensibly valid, but not actually valid | - |
| stannous | (adjective) of or relating to or containing tin | Synonyms: stannic |
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| stertorous | (adjective) of breathing having a heavy snoring sound | - |
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| stoloniferous | (adjective) producing stolons | - |
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| stomatous | (adjective) having a mouth or mouthlike opening | - |
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| (adjective) relating to or constituting plant stomata | Synonyms: stomatal |
| (adjective) relating to or of the nature of or having a mouth or mouthlike opening | Synonyms: stomatal |
| strenuous | (adjective) taxing to the utmost; testing powers of endurance | Synonyms: arduous, straining |
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| (adjective) characterized by or performed with much energy or force | - |
| studious | (adjective) marked by care and effort | - |
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| (adjective) characterized by diligent study and fondness for reading | Synonyms: bookish |
| stupendous | (adjective) so great in size or force or extent as to elicit awe | Synonyms: colossal, prodigious |
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| stuporous | (adjective) stunned or confused and slow to react (as from blows or drunkenness or exhaustion) | Synonyms: dazed, foggy, groggy, logy |
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| subaqueous | (adjective) growing or remaining under water | Synonyms: subaquatic, submerged, submersed, underwater |
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| subconscious | (adjective) just below the level of consciousness | - |
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| subcutaneous | (adjective) relating to or located below the epidermis | Synonyms: hypodermic |
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| subterraneous | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterranean |
| sulfurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulphurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulphurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulphurous, virulent, vitriolic |
| sulphurous | (adjective) of or related to or containing sulfur or derived from sulfur | Synonyms: sulfurous |
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| (adjective) characterized by oppressive heat and humidity | Synonyms: stifling, sulfurous, sultry |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, virulent, vitriolic |
| sumptuous | (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, luxurious, opulent, princely |
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| supercilious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, imperious, lordly, overbearing, prideful, sniffy, swaggering |
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| (adjective) expressive of contempt | Synonyms: sneering, snide |
| superfluous | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, supernumerary, surplus |
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| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, senseless, wasted |
| superstitious | (adjective) showing ignorance of the laws of nature and faith in magic or chance | - |
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| suppositious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, supposititious |
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| supposititious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious |
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| surreptitious | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: furtive, sneak, sneaky, stealthy |
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| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, undercover, underground |
| suspicious | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, untrusting, wary |
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| (adjective) not as expected | Synonyms: fishy, funny, shady, suspect |
| susurrous | (adjective) characterized by soft sounds | Synonyms: murmurous, rustling, soughing |
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| sympetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: gamopetalous |
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| symphonious | (adjective) harmonious in sound | Synonyms: symphonic |
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| syncarpous | (adjective) (of ovaries of flowering plants) consisting of united carpels | - |
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| synchronous | (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronal, synchronic |
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| (adjective) (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions | - |
| synoecious | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoicous |
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| synoicous | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoecious |
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| synonymous | (adjective) (of words) meaning the same or nearly the same | - |
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| tedious | (adjective) using or containing too many words | Synonyms: long-winded, verbose, windy, wordy |
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| (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, deadening, dull, ho-hum, irksome, slow, tiresome, wearisome |
| temerarious | (adjective) presumptuously daring | Synonyms: daredevil |
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| tempestuous | (adjective) (of the elements) as if showing violent anger | Synonyms: angry, furious, raging, wild |
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| (adjective) characterized by violent emotions or behavior | Synonyms: stormy |
| tenacious | (adjective) good at remembering | Synonyms: long, recollective, retentive |
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| (adjective) sticking together | Synonyms: coherent |
| (adjective) stubbornly unyielding | Synonyms: dogged, dour, persistent, pertinacious, unyielding |
| tendencious | (adjective) having or marked by a strong tendency especially a controversial one | Synonyms: tendentious |
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| tendentious | (adjective) having or marked by a strong tendency especially a controversial one | Synonyms: tendencious |
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| tendinous | (adjective) consisting of tendons or resembling a tendon | Synonyms: sinewy |
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| tenebrious | (adjective) dark and gloomy | Synonyms: tenebrific, tenebrous |
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| tenebrous | (adjective) dark and gloomy | Synonyms: tenebrific, tenebrious |
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| tenuous | (adjective) lacking substance or significance | Synonyms: flimsy, fragile, slight, thin |
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| (adjective) very thin in gauge or diameter | - |
| (adjective) having thin consistency | - |
| testaceous | (adjective) relating to or possessing a testa or hard shell | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| timorous | (adjective) timid by nature or revealing timidity | Synonyms: fearful, trepid |
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| tomentous | (adjective) densely covered with short matted woolly hairs | Synonyms: tomentose |
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| tortious | (adjective) of or pertaining to the nature of a tort | - |
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| tortuous | (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, involved, knotty, labyrinthine, tangled |
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| (adjective) marked by repeated turns and bends | Synonyms: twisting, twisty, voluminous, winding |
| (adjective) not straightforward | - |
| torturous | (adjective) extremely painful | Synonyms: agonising, agonizing, excruciating, harrowing, torturesome, torturing |
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| traitorous | (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, treasonable, treasonous, unfaithful |
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| tralatitious | (adjective) having been passed along from generation to generation | Synonyms: handed-down |
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| transcutaneous | (adjective) through the unbroken skin; refers to medications applied directly to the skin (creams or ointments) or in time-release forms (skin patches) | Synonyms: percutaneous, transdermal, transdermic |
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| treacherous | (adjective) dangerously unstable and unpredictable | Synonyms: unreliable |
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| (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: perfidious, punic |
| treasonous | (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, unfaithful |
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| tremendous | (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, phenomenal, rattling, terrific, wonderful, wondrous |
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| (adjective) extraordinarily large in size or extent or amount or power or degree | Synonyms: enormous |
| (adjective) extreme in degree or extent or amount or impact | Synonyms: awful, frightful, terrible |
| tremulous | (adjective) (of the voice) quivering as from weakness or fear | Synonyms: quavering |
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| troublous | (adjective) full of trouble | - |
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| tuberculous | (adjective) constituting or afflicted with or caused by tuberculosis or the tubercle bacillus | Synonyms: tubercular |
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| tuberous | (adjective) of or relating to or resembling a tuber | - |
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| tumultuous | (adjective) characterized by unrest or disorder or insubordination | Synonyms: disruptive, riotous, troubled, turbulent |
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| tyrannous | (adjective) marked by unjust severity or arbitrary behavior | Synonyms: oppressive, tyrannical |
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| ubiquitous | (adjective) being present everywhere at once | Synonyms: omnipresent |
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| ulcerous | (adjective) having an ulcer or canker | Synonyms: cankerous, ulcerated |
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| umbelliferous | (adjective) relating to or belonging to plants of the family Umbelliferae | - |
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| umbrageous | (adjective) angered at something unjust or wrong | Synonyms: incensed, indignant, outraged |
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| (adjective) filled with shade | Synonyms: shadowed, shadowy, shady |
| unadventurous | (adjective) lacking in boldness | - |
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| unambiguous | (adjective) having or exhibiting a single clearly defined meaning | - |
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| (adjective) admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion | Synonyms: unequivocal, univocal |
| unambitious | (adjective) having little desire for success or achievement | Synonyms: ambitionless |
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| unanimous | (adjective) in complete agreement | Synonyms: consentaneous, consentient |
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| (adjective) acting together as a single undiversified whole | Synonyms: solid, whole |
| unceremonious | (adjective) without due formalities | - |
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| (adjective) without ceremony or formality | Synonyms: unceremonial |
| unchivalrous | (adjective) offensively discourteous | Synonyms: caddish, ungallant |
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| unconscientious | (adjective) not conscientious | - |
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| unconscious | (adjective) not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead | - |
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| (adjective) without conscious volition | - |
| (adjective) (followed by `of') not knowing or perceiving | - |
| unctuous | (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, oleaginous, smarmy, soapy |
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| undesirous | (adjective) having or feeling no desire | Synonyms: undesiring |
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| unfastidious | (adjective) marked by an absence of due or proper care or attention to detail; not concerned with cleanliness | - |
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| (adjective) not exacting in nutritional requirements | - |
| ungenerous | (adjective) lacking in magnanimity | Synonyms: meanspirited |
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| (adjective) unwilling to spend (money, time, resources, etc.) | Synonyms: stingy |
| unglamorous | (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, humdrum, prosaic, unglamourous |
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| unglamourous | (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, humdrum, prosaic, unglamorous |
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| ungracious | (adjective) lacking charm and good taste | - |
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| (adjective) lacking social graces | Synonyms: discourteous |
| ungregarious | (adjective) (of animals) not gregarious | - |
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| (adjective) (of plants) growing together in groups that are not close together | - |
| (adjective) not disposed to seek company | - |
| unharmonious | (adjective) not in harmony | Synonyms: inharmonious |
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| unhazardous | (adjective) thought to be devoid of risk | Synonyms: risk-free, riskless |
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| unhumorous | (adjective) lacking humor | Synonyms: humorless, humourless |
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| uniparous | (adjective) producing only one offspring at a time | - |
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| unmalicious | (adjective) not malicious or spiteful | - |
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| unmelodious | (adjective) lacking melody | Synonyms: unmelodic, unmusical |
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| (adjective) not having a musical sound or pleasing tune | Synonyms: tuneless, untuneful |
| unmeritorious | (adjective) without merit | - |
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| unobvious | (adjective) not immediately apparent | - |
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| unostentatious | (adjective) not ostentatious | Synonyms: unpretending, unpretentious |
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| (adjective) exhibiting restrained good taste | Synonyms: understated, unpretentious |