| startling | (adjective) so remarkably different or sudden as to cause momentary shock or alarm | - |
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| sterling | (adjective) highest in quality | Synonyms: greatest, superlative |
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| stifling | (adjective) characterized by oppressive heat and humidity | Synonyms: sulfurous, sulphurous, sultry |
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| straggling | (adjective) spreading out in different directions or distributed irregularly | Synonyms: rambling, sprawling, straggly |
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| struggling | (adjective) engaged in a struggle to overcome especially poverty or obscurity | - |
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| sublingual | (adjective) beneath the tongue | - |
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| swashbuckling | (adjective) flamboyantly adventurous | Synonyms: swaggering |
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| tattling | (adjective) prone to communicate confidential information | Synonyms: blabbermouthed, leaky, talebearing |
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| telling | (adjective) producing a strong effect | Synonyms: impressive |
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| (adjective) disclosing unintentionally something concealed | Synonyms: revealing, telltale |
| (adjective) powerfully persuasive | Synonyms: cogent, weighty |
| 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 | - |
| tickling | (adjective) exciting by touching lightly so as to cause laughter or twitching movements | Synonyms: tingling, titillating |
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| tingling | (adjective) exciting by touching lightly so as to cause laughter or twitching movements | Synonyms: tickling, titillating |
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| tinkling | (adjective) like the short high ringing sound of a small bell | Synonyms: tinkly |
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| toiling | (adjective) doing arduous or unpleasant work | Synonyms: drudging, laboring, labouring |
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| trembling | (adjective) vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze | Synonyms: shaky, shivering |
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| trifling | (adjective) not worth considering | Synonyms: negligible, paltry |
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| trilingual | (adjective) using or knowing three languages | - |
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| troubling | (adjective) causing distress or worry or anxiety | Synonyms: distressful, distressing, disturbing, perturbing, worrisome, worrying |
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| twinkling | (adjective) shining intermittently with a sparkling light | - |
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| unappealing | (adjective) not able to attract favorable attention | - |
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| (adjective) (of characters in literature or drama) tending to evoke antipathetic feelings | Synonyms: unlikable, unlikeable, unsympathetic |
| unavailing | (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, otiose |
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| unfailing | (adjective) tireless | Synonyms: unflagging |
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| (adjective) always able to supply more | - |
| (adjective) not liable to failure | Synonyms: foolproof |
| unfeeling | (adjective) devoid of feeling or sensation | - |
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| (adjective) devoid of feeling for others | Synonyms: hardhearted, stonyhearted |
| unsmiling | (adjective) not smiling | - |
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| unwilling | (adjective) not disposed to and refusing to do something | - |
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| (adjective) in spite of contrary volition | - |
| wailing | (adjective) vocally expressing grief or sorrow or resembling such expression | Synonyms: lamenting, wailful |
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| willing | (adjective) disposed or inclined toward | - |
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| (adjective) not brought about by coercion or force | Synonyms: uncoerced, unforced |
| wobbling | (adjective) (of sound) fluctuating unsteadily | - |
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| wriggling | (adjective) moving in a twisting or snake-like or wormlike fashion | Synonyms: wiggly, wriggly, writhing |
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