| 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 |
| treacly | (adjective) overly sweet | Synonyms: cloying, saccharine, syrupy |
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| treasonable | (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonous, unfaithful |
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| treasonous | (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, unfaithful |
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| treasured | (adjective) characterized by feeling or showing fond affection for | Synonyms: cherished, precious, wanted |
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| treated | (adjective) subjected to a physical (or chemical) treatment or action or agent | - |
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| (adjective) given medical care or treatment | - |
| (adjective) made hard or flexible or resilient especially by heat treatment | Synonyms: hardened, tempered, toughened |
| treble | (adjective) having or denoting a high range | Synonyms: soprano |
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| (adjective) three times as great or many | Synonyms: three-fold, threefold, triple |
| (adjective) having three units or components or elements | Synonyms: ternary, triple, triplex |
| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: double, dual, three-fold, threefold, two-fold, twofold |
| treed | (adjective) forced to turn and face attackers | Synonyms: at bay, cornered, trapped |
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| treeless | (adjective) not wooded | Synonyms: unwooded |
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| treelike | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped |
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| tref | (adjective) not conforming to dietary laws | Synonyms: nonkosher, terefah |
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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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| 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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| trenchant | (adjective) clearly or sharply defined to the mind | Synonyms: clear-cut, distinct |
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| (adjective) characterized by or full of force and vigor | Synonyms: hard-hitting |
| (adjective) having keenness and forcefulness and penetration in thought, expression, or intellect | Synonyms: searching |
| trendsetting | (adjective) initiating or popularizing a trend | Synonyms: trend-setting |
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| trendy | (adjective) in accord with the latest fad | Synonyms: voguish |
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| trepid | (adjective) timid by nature or revealing timidity | Synonyms: fearful, timorous |
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| trespassing | (adjective) gradually intrusive without right or permission | Synonyms: encroaching, invasive |
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