| trimotored | (adjective) having three motors | - |
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| ultimate | (adjective) furthest or highest in degree or order; utmost or extreme | - |
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| (adjective) being the last or concluding element of a series | - |
| ultimo | (adjective) in or of the month preceding the present one | Synonyms: ult |
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| unanimated | (adjective) not animated or enlivened; dull | - |
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| unanimous | (adjective) in complete agreement | Synonyms: consentaneous, consentient |
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| (adjective) acting together as a single undiversified whole | Synonyms: solid, whole |
| unclaimed | (adjective) not claimed or called for by an owner or assignee | - |
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| unclimbable | (adjective) incapable of being ascended | Synonyms: unscalable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unsurmountable |
| uncomplimentary | (adjective) tending to (or intended to) detract or disparage | - |
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| (adjective) showing or representing unfavorably | Synonyms: unflattering |
| undiminished | (adjective) not lessened or diminished | Synonyms: unrelieved |
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| undimmed | (adjective) not made dim or less bright | Synonyms: bright |
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| undiscriminating | (adjective) not discriminating | Synonyms: indiscriminating |
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| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
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| unimaginable | (adjective) totally unlikely | Synonyms: impossible, inconceivable, out of the question |
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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 |
| unimagined | (adjective) not imagined even in a dream | Synonyms: undreamed, undreamed of, undreamt, undreamt of |
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| unimodal | (adjective) having a single mode | - |
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| unimpaired | (adjective) not damaged or diminished in any respect | - |
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| unimpassioned | (adjective) free from emotional appeal; marked by reasonableness | - |
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| unimpeachable | (adjective) completely acceptable; not open to exception or reproach | Synonyms: unexceptionable |
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| (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, irreproachable |
| (adjective) beyond doubt or reproach | - |
| unimpeded | (adjective) not slowed or prevented | - |
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| unimportant | (adjective) not important | - |
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| (adjective) devoid of importance, meaning, or force | Synonyms: insignificant |
| unimposing | (adjective) lacking in impressiveness | - |
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| unimpregnated | (adjective) not having been fertilized | Synonyms: unfertilised, unfertilized |
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| unimpressed | (adjective) not moved to serious regard | - |
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| unimpressionable | (adjective) not sensitive or susceptible to impression | - |
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| unimpressive | (adjective) not capable of impressing | - |
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| unimprisoned | (adjective) free from confinement or physical restraint | Synonyms: unconfined |
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| unimproved | (adjective) not made more desirable or valuable or profitable; especially not made ready for use or marketing | - |
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| (adjective) (of land) not cleared of trees and brush; in the wild or natural state | - |
| unintimidated | (adjective) not shrinking from danger | Synonyms: unblinking, unflinching, unshrinking |
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| unlimited | (adjective) having no limits in range or scope | Synonyms: limitless |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: inexhaustible |
| (adjective) without reservation or exception | Synonyms: outright, straight-out |
| unrimed | (adjective) not having rhyme | Synonyms: rhymeless, rimeless, unrhymed |
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| unsentimental | (adjective) facing facts or difficulties realistically and with determination | Synonyms: tough-minded |
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| unstimulating | (adjective) not stimulating | Synonyms: unexciting |
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| untimbered | (adjective) lacking timbers | - |
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| (adjective) without trees | - |
| untimely | (adjective) uncommonly early or before the expected time | Synonyms: premature |
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| (adjective) badly timed | Synonyms: ill-timed, unseasonable, wrong |
| untrimmed | (adjective) not trimmed | Synonyms: uncut |
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| verbatim | (adjective) in precisely the same words used by a writer or speaker | Synonyms: direct |
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| verisimilar | (adjective) appearing to be true or real | - |
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| victimised | (adjective) (of persons) taken advantage of | Synonyms: exploited, ill-used, put-upon, used, victimized |
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| victimized | (adjective) (of persons) taken advantage of | Synonyms: exploited, ill-used, put-upon, used, victimised |
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| vigesimal | (adjective) relating to or based on the number twenty | - |
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| viscosimetric | (adjective) of or relating to the measurement of viscosity | Synonyms: viscometric |
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| whimsical | (adjective) determined by chance or impulse or whim rather than by necessity or reason | Synonyms: capricious, impulsive |
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| wimpish | (adjective) weak and ineffectual | Synonyms: wimpy |
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| wimpy | (adjective) weak and ineffectual | Synonyms: wimpish |
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