| 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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| turbinate | (adjective) of or relating to the scroll-shaped turbinate bones in the nasal passages | - |
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| (adjective) in the shape of a coil | Synonyms: coiling, helical, spiral, spiraling, spiralling, volute, voluted, whorled |
| ultranationalistic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, jingoistic, nationalistic, superpatriotic |
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| unaffectionate | (adjective) lacking affection or warm feeling | Synonyms: detached, uncaring |
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| unattached | (adjective) not associated in an exclusive sexual relationship | Synonyms: uncommitted |
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| (adjective) not fastened together | - |
| (adjective) (of animals) able to swim about; not attached | Synonyms: free-swimming |
| unattackable | (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unassailable |
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| unattainable | (adjective) impossible to achieve | Synonyms: unachievable, undoable, unrealizable |
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| unattended | (adjective) lacking accompaniment or a guard or escort | - |
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| (adjective) lacking a caretaker | Synonyms: neglected |
| (adjective) not watched | - |
| unattired | (adjective) having removed clothing | Synonyms: unappareled, unclad, undressed, ungarbed, ungarmented |
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| unattractive | (adjective) lacking beauty or charm | - |
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| (adjective) lacking power to arouse interest | - |
| (adjective) not appealing to the senses | Synonyms: untempting |
| unattributable | (adjective) not attributable | Synonyms: unascribable |
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| uncarbonated | (adjective) not having carbonation | Synonyms: noncarbonated |
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| uncompassionate | (adjective) lacking compassion or feeling for others | - |
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| uncontaminated | (adjective) not corrupted by contact or association | - |
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| (adjective) free from admixture with noxious elements; clean | Synonyms: unpolluted |
| uncontaminating | (adjective) not spreading pollution or contamination; especially radioactive contamination | Synonyms: clean |
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| uncoordinated | (adjective) lacking the skillful and effective interaction of muscle movements | - |
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| (adjective) lacking in cooperative planning and organization | - |
| undenominational | (adjective) not bound or devoted to the promotion of a particular denomination | - |
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| undiscriminating | (adjective) not discriminating | Synonyms: indiscriminating |
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| unfortunate | (adjective) not favored by fortune; marked or accompanied by or resulting in ill fortune | - |
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| (adjective) not auspicious; boding ill | Synonyms: inauspicious |
| (adjective) unsuitable or regrettable | - |
| unilluminated | (adjective) without illumination | Synonyms: lightless, unlighted, unlit |
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| unilluminating | (adjective) failing to inform or clarify | Synonyms: unenlightening |
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| unimaginative | (adjective) lacking spontaneity or originality or individuality | Synonyms: stereotyped, stereotypic, stereotypical |
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| (adjective) dealing only with concrete facts | - |
| (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, uninspired, uninventive |
| unimpregnated | (adjective) not having been fertilized | Synonyms: unfertilised, unfertilized |
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| unmyelinated | (adjective) (of neurons) not myelinated | - |
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| unnatural | (adjective) not in accordance with or determined by nature; contrary to nature | - |
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| (adjective) not normal; not typical or usual or regular or conforming to a norm | Synonyms: abnormal |
| (adjective) speaking or behaving in an artificial way to make an impression | Synonyms: affected |
| unnaturalised | (adjective) not having acquired citizenship | Synonyms: unnaturalized |
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| unnaturalized | (adjective) not having acquired citizenship | Synonyms: unnaturalised |
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| unoxygenated | (adjective) (used of blood) not supplied with oxygen | Synonyms: unaerated |
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| unvaccinated | (adjective) not vaccinated | - |
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| vaccinated | (adjective) having been rendered unsusceptible to a disease | Synonyms: immunised, immunized |
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