| rectilinear | (adjective) characterized by a straight line or lines | Synonyms: rectilineal |
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| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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| rehabilitative | (adjective) designed to accomplish rehabilitation | - |
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| (adjective) helping to restore to good condition | Synonyms: reconstructive |
| reptilian | (adjective) of or relating to the class Reptilia | - |
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| resilient | (adjective) elastic; rebounds readily | Synonyms: bouncy, live, lively, springy |
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| (adjective) recovering readily from adversity, depression, or the like | - |
| retractile | (adjective) capable of retraction; capable of being drawn back | - |
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| riled | (adjective) aroused to impatience or anger | Synonyms: annoyed, irritated, miffed, nettled, peeved, pissed, pissed off, roiled, steamed, stung |
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| roiled | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiling, roily, turbulent |
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| (adjective) aroused to impatience or anger | Synonyms: annoyed, irritated, miffed, nettled, peeved, pissed, pissed off, riled, steamed, stung |
| roiling | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiled, roily, turbulent |
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| roily | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiled, roiling, turbulent |
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| sacrilegious | (adjective) grossly irreverent toward what is held to be sacred | Synonyms: blasphemous, profane |
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| saxatile | (adjective) growing on or living among rocks | Synonyms: saxicoline, saxicolous |
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| scintillant | (adjective) having brief brilliant points or flashes of light | Synonyms: aglitter, coruscant, fulgid, glinting, glistering, glittering, glittery, scintillating, sparkly |
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| scintillating | (adjective) having brief brilliant points or flashes of light | Synonyms: aglitter, coruscant, fulgid, glinting, glistering, glittering, glittery, scintillant, sparkly |
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| (adjective) brilliantly clever | - |
| (adjective) marked by high spirits or excitement | Synonyms: bubbling, effervescent, frothy, sparkly |
| scurrilous | (adjective) expressing offensive reproach | Synonyms: abusive, opprobrious |
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| semiliquid | (adjective) somewhat liquid | - |
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| semiliterate | (adjective) literate but poorly informed | - |
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| (adjective) barely able to read and write | - |
| (adjective) able to read but not to write | - |
| semilunar | (adjective) resembling the new moon in shape | Synonyms: crescent-shaped, crescent, lunate |
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| semiskilled | (adjective) possessing or requiring limited skills | - |
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| senile | (adjective) mentally or physically infirm with age | Synonyms: doddering, doddery, gaga |
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| servile | (adjective) submissive or fawning in attitude or behavior | - |
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| (adjective) relating to or involving slaves or appropriate for slaves or servants | - |
| sessile | (adjective) attached directly by the base; not having an intervening stalk | Synonyms: stalkless |
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| (adjective) permanently attached to a substrate; not free to move about | - |
| shopsoiled | (adjective) worn or faded from being on display in a store | Synonyms: shopworn |
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| shrill | (adjective) of colors that are bright and gaudy | - |
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| (adjective) having or emitting a high-pitched and sharp tone or tones | Synonyms: sharp |
| (adjective) being sharply insistent on being heard | Synonyms: strident |
| 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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| 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 |
| 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 | - |
| skilful | (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, practiced, proficient, skillful |
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| skilled | (adjective) having or showing or requiring special skill | - |
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| skillful | (adjective) done with delicacy and skill | Synonyms: nice |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, practiced, proficient, skilful |
| smiling | (adjective) smiling with happiness or optimism | Synonyms: beamish, twinkly |
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| soiled | (adjective) soiled or likely to soil with dirt or grime | Synonyms: dirty, unclean |
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| spoilable | (adjective) liable to decay or spoil or become putrid | Synonyms: decayable, putrefiable, putrescible |
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| spoiled | (adjective) having the character or disposition harmed by pampering or oversolicitous attention | Synonyms: spoilt |
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| (adjective) (of foodstuffs) not in an edible or usable condition | Synonyms: bad, spoilt |
| spoilt | (adjective) affected by blight; anything that mars or prevents growth or prosperity | Synonyms: blighted |
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| (adjective) having the character or disposition harmed by pampering or oversolicitous attention | Synonyms: spoiled |
| (adjective) (of foodstuffs) not in an edible or usable condition | Synonyms: bad, spoiled |
| stabile | (adjective) not able or intended to be moved | Synonyms: immovable, immoveable, unmovable |
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| (adjective) (chemistry, physics, biology) resistant to change | - |
| stabilised | (adjective) made stable or firm | Synonyms: stabilized |
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| stabilising | (adjective) causing to become stable | Synonyms: stabilizing |
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| stabilized | (adjective) made stable or firm | Synonyms: stabilised |
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| stabilizing | (adjective) causing to become stable | Synonyms: stabilising |
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| sterile | (adjective) incapable of reproducing | Synonyms: infertile, unfertile |
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| (adjective) free of or using methods to keep free of pathological microorganisms | Synonyms: aseptic |
| (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: unimaginative, uninspired, uninventive |
| sterilised | (adjective) made infertile | Synonyms: sterilized |
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| sterilized | (adjective) made infertile | Synonyms: sterilised |
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| still | (adjective) not sparkling | Synonyms: noneffervescent |
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| (adjective) used of pictures; of a single or static photograph not presented so as to create the illusion of motion; or representing objects not capable of motion | - |
| (adjective) (of a body of water) free from disturbance by heavy waves | Synonyms: placid, quiet, smooth, tranquil, unruffled |
| (adjective) marked by absence of sound | Synonyms: silent, soundless |
| (adjective) not in physical motion | Synonyms: inactive, motionless, static |
| (adjective) free from noticeable current | - |
| stillborn | (adjective) (of newborn infant) showing no signs of life at birth; not liveborn | - |
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| (adjective) failing to accomplish an intended result | Synonyms: abortive, unsuccessful |
| stilly | (adjective) (poetic) still or calm | - |
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| stilted | (adjective) artificially formal | Synonyms: artificial, contrived, hokey |
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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 |
| syphilitic | (adjective) of or relating to or infected with syphilis | - |
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| tactile | (adjective) of or relating to or proceeding from the sense of touch | Synonyms: haptic, tactual |
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| (adjective) producing a sensation of touch | Synonyms: tactual |
| tailed | (adjective) having a tail of a specified kind; often used in combination | - |
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| tailless | (adjective) not having a tail | Synonyms: anurous |
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| taillike | (adjective) resembling a tail | Synonyms: caudal |
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| tailored | (adjective) (of clothing) custom-made | Synonyms: bespoke, bespoken, made-to-order, tailor-made |
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| (adjective) severely simple in line or design | Synonyms: trim |
| technophilic | (adjective) of or relating to or showing technophilia | - |
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| tensile | (adjective) of or relating to tension | - |
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| (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, malleable, pliable, pliant, tractile |
| textile | (adjective) of or relating to fabrics or fabric making | - |
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| thermolabile | (adjective) (chemistry, physics, biology) readily changed or destroyed by heat | - |
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| thrilled | (adjective) feeling intense pleasurable excitement | - |
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| thrillful | (adjective) full of excitement; thrilled | - |
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| thrilling | (adjective) causing a surge of emotion or excitement | Synonyms: electrifying |
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| (adjective) causing quivering or shivering as by cold or fear or electric shock | - |
| tiled | (adjective) covered or furnished with tiles | - |
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| tillable | (adjective) (of farmland) capable of being farmed productively | Synonyms: arable, cultivable, cultivatable |
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| tilled | (adjective) turned or stirred by plowing or harrowing or hoeing | - |
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| tilted | (adjective) departing or being caused to depart from the true vertical or horizontal | Synonyms: atilt, canted, leaning, tipped |
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| titillated | (adjective) feeling mild pleasurable excitement | Synonyms: teased |
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| titillating | (adjective) giving sexual pleasure; sexually arousing | Synonyms: erotic |
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| (adjective) pleasantly and superficially exciting | - |
| (adjective) exciting by touching lightly so as to cause laughter or twitching movements | Synonyms: tickling, tingling |
| toiling | (adjective) doing arduous or unpleasant work | Synonyms: drudging, laboring, labouring |
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| toilsome | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing |
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| tractile | (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, malleable, pliable, pliant, tensile |
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| tranquil | (adjective) (of a body of water) free from disturbance by heavy waves | Synonyms: placid, quiet, smooth, still, unruffled |
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| (adjective) not agitated; without losing self-possession | Synonyms: calm, serene, unagitated |
| tranquilising | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, sedative, tranquilizing, tranquillising, tranquillizing |
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| tranquilizing | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, sedative, tranquilising, tranquillising, tranquillizing |
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| tranquillising | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, sedative, tranquilising, tranquilizing, tranquillizing |
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| tranquillizing | (adjective) tending to soothe or tranquilize | Synonyms: ataractic, ataraxic, sedative, tranquilising, tranquilizing, tranquillising |
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| trilateral | (adjective) having three sides | Synonyms: three-sided, triangular |
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| (adjective) involving three parties | - |
| trilingual | (adjective) using or knowing three languages | - |
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| trilled | (adjective) uttered with a trill | Synonyms: rolled, rolling |
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| trillion | (adjective) one million million in the United States | - |
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| (adjective) one quintillion in Great Britain | - |
| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| trilobate | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobated, trilobed |
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| trilobated | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobed |
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| trilobed | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobated |
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| twilight | (adjective) lighted by or as if by twilight | Synonyms: dusky, twilit |
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| twilit | (adjective) lighted by or as if by twilight | Synonyms: dusky, twilight |
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| twilled | (adjective) of textiles; having parallel raised lines | Synonyms: corded |
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| umbilical | (adjective) relating to or resembling the umbilicus | - |
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