| triangular | (adjective) having three angles; forming or shaped like a triangle | - |
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| (adjective) having three sides | Synonyms: three-sided, trilateral |
| triangulate | (adjective) composed of or marked with triangles | - |
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| tribadistic | (adjective) of female homosexual behavior that attempts to simulate heterosexual behavior | - |
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| tribal | (adjective) relating to or characteristic of a tribe | - |
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| tributary | (adjective) tending to bring about; being partly responsible for | Synonyms: conducive, contributing, contributive, contributory |
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| (adjective) paying tribute | - |
| (adjective) (of a stream) flowing into a larger stream | - |
| tricentenary | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentennial |
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| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| trichromatic | (adjective) having or involving three colors | Synonyms: trichrome, tricolor |
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| trichrome | (adjective) having or involving three colors | Synonyms: trichromatic, tricolor |
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| tricksy | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricky, wily |
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| tricky | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, wily |
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| (adjective) having concealed difficulty | Synonyms: catchy |
| (adjective) not to be trusted | Synonyms: slippery |
| triclinic | (adjective) having three unequal crystal axes intersecting at oblique angles | Synonyms: anorthic |
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| tricolor | (adjective) having or involving three colors | Synonyms: trichromatic, trichrome |
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| tricuspid | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspidate |
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| tricuspidate | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspid |
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| tried | (adjective) tested and proved useful or correct | Synonyms: tested, well-tried |
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| (adjective) tested and proved to be reliable | Synonyms: tested, time-tested, tried and true |
| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| trifid | (adjective) divided into three lobes | - |
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| trifling | (adjective) not worth considering | Synonyms: negligible, paltry |
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| trifoliate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliated, trifoliolate |
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| trifoliated | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliolate |
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| trifoliolate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliated |
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| trig | (adjective) neat and smart in appearance | Synonyms: clean-cut, trim |
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| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |
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| trihydroxy | (adjective) containing three hydroxyl groups | - |
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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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| trim | (adjective) severely simple in line or design | Synonyms: tailored |
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| (adjective) thin and fit | Synonyms: spare |
| (adjective) characterized by order and neatness; free from disorder | Synonyms: shipshape, well-kept |
| (adjective) neat and smart in appearance | Synonyms: clean-cut, trig |
| trimmed | (adjective) made neat and tidy by trimming | Synonyms: cut |
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| trimotored | (adjective) having three motors | - |
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| trinuclear | (adjective) having three nuclei | Synonyms: trinucleate, trinucleated |
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| trinucleate | (adjective) having three nuclei | Synonyms: trinuclear, trinucleated |
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| trinucleated | (adjective) having three nuclei | Synonyms: trinuclear, trinucleate |
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| tripartite | (adjective) involving three parties or elements | Synonyms: three-party, three-way |
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| tripinnate | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnated |
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| tripinnated | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnate |
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| tripinnatifid | (adjective) (of a leaf shape) bipinnatifid with segments pinnatifid | - |
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| triple | (adjective) having three units or components or elements | Synonyms: ternary, treble, triplex |
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| (adjective) three times as great or many | Synonyms: three-fold, threefold, treble |
| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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| triploid | (adjective) of a cell or organism having three complete sets of chromosomes | - |
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| tripping | (adjective) moving easily and quickly; nimble | Synonyms: light, lightsome |
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| (adjective) characterized by a buoyant rhythm | Synonyms: lilting, swinging, swingy |
| triskaidekaphobic | (adjective) suffering from triskaidekaphobia (abnormal fear of the number 13) | - |
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| tritanopic | (adjective) inability to see the color blue or to distinguish the colors blue and yellow | Synonyms: blue-blind |
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| trite | (adjective) repeated too often; overfamiliar through overuse | Synonyms: banal, commonplace, hackneyed, old-hat, shopworn, stock, threadbare, timeworn, tired, well-worn |
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| triumphal | (adjective) relating to or celebrating a triumph | - |
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| (adjective) joyful and proud especially because of triumph or success | Synonyms: exultant, exulting, jubilant, prideful, rejoicing, triumphant |
| triumphant | (adjective) joyful and proud especially because of triumph or success | Synonyms: exultant, exulting, jubilant, prideful, rejoicing, triumphal |
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| (adjective) experiencing triumph | Synonyms: victorious |
| triune | (adjective) being three in one; used especially of the Christian Trinity | - |
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| trivalent | (adjective) having a valence of three | - |
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| trivial | (adjective) concerned with trivialities | - |
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| (adjective) of little substance or significance | Synonyms: superficial |
| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, lilliputian, little, niggling, petty, picayune, piddling, piffling |