| unargumentative | (adjective) not given to or characterized by argument | - |
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| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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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 |
| uncommunicative | (adjective) not inclined to talk or give information or express opinions | Synonyms: incommunicative |
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| uncompetitive | (adjective) not inclined to compete | - |
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| unconstructive | (adjective) not constructive | - |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| uncreative | (adjective) not creative | - |
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| undemonstrative | (adjective) not given to open expression of emotion | - |
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| underactive | (adjective) abnormally inactive | Synonyms: hypoactive |
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| underivative | (adjective) not derivative or imitative | - |
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| undescriptive | (adjective) not successful in describing | - |
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| uneffective | (adjective) not producing an intended effect | Synonyms: ineffective, ineffectual |
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| unexclusive | (adjective) not restricted or exclusive | Synonyms: unrestricted |
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| unexpansive | (adjective) showing no tendency to expand | - |
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| (adjective) not given to high spirits or effusiveness | - |
| unexplorative | (adjective) not exploratory | Synonyms: nonexplorative, nonexploratory, unexploratory |
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| unexpressive | (adjective) deliberately impassive in manner | Synonyms: deadpan, expressionless, impassive, poker-faced |
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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 |
| unimpressive | (adjective) not capable of impressing | - |
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| uninformative | (adjective) lacking information | - |
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| uninquisitive | (adjective) not inquiring | Synonyms: uninquiring |
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| (adjective) deficient in curiosity | Synonyms: uninquiring |
| uninstructive | (adjective) failing to instruct | - |
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| unintrusive | (adjective) not interfering or meddling | Synonyms: not intrusive |
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| uninventive | (adjective) deficient in originality or creativity; lacking powers of invention | Synonyms: sterile, unimaginative, uninspired |
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| univalve | (adjective) used of mollusks, especially gastropods, as snails etc. | - |
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| unmedicative | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: nonmedicinal, unmedical, unmedicinal |
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| unobjective | (adjective) (of e.g. evidence) not objective or easily verified | Synonyms: unverifiable |
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| unobtrusive | (adjective) not obtrusive or undesirably noticeable | - |
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| unperceptive | (adjective) lacking perception | Synonyms: unperceiving |
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| (adjective) lacking sensitivity, taste, or judgment | - |
| unpermissive | (adjective) not inclined to grant permission; severe in discipline | - |
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| unpersuasive | (adjective) not capable of persuading | - |
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| unpredictive | (adjective) having no predictive value | - |
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| unproductive | (adjective) not producing or capable of producing | - |
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| (adjective) not producing desired results | - |
| unprogressive | (adjective) old-fashioned and out of date | Synonyms: fusty, nonprogressive, standpat |
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| unprotective | (adjective) not affording protection | - |
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| unprovocative | (adjective) not provocative | Synonyms: unprovoking |
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| unreactive | (adjective) (chemistry) not reacting chemically | - |
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| (adjective) not tending to react to stimulation | - |
| unreceptive | (adjective) not receptive | - |
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| unreflective | (adjective) not exhibiting or characterized by careful thought | Synonyms: unthinking, unthoughtful |
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| unremunerative | (adjective) not yielding profit or recompense | - |
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| unrepresentative | (adjective) not exemplifying a class | - |
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| unresponsive | (adjective) not responding to some influence or stimulus | - |
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| (adjective) aloof or indifferent | - |
| (adjective) not susceptible to suggestion or influence | - |
| unrestrictive | (adjective) not tending to restrict | - |
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| unretentive | (adjective) (of memory) deficient in retentiveness or range | Synonyms: forgetful, short |
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| unseductive | (adjective) not seductive | - |
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| unselective | (adjective) not selective or discriminating | - |
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| unsubmissive | (adjective) not servile or submissive | Synonyms: unservile |
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| unsupportive | (adjective) not furnishing support or assistance | - |
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| untalkative | (adjective) temperamentally disinclined to talk | Synonyms: reticent |
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| unvindictive | (adjective) not vindictive | - |
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| vegetative | (adjective) composed of vegetation or plants | Synonyms: vegetal, vegetational |
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| (adjective) of or relating to an activity that is passive and monotonous | Synonyms: vegetive |
| (adjective) (of reproduction) characterized by asexual processes | Synonyms: vegetal |
| (adjective) relating to involuntary bodily functions | - |
| vegetive | (adjective) of or relating to an activity that is passive and monotonous | Synonyms: vegetative |
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| vindictive | (adjective) showing malicious ill will and a desire to hurt; motivated by spite | Synonyms: despiteful, spiteful |
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| (adjective) disposed to seek revenge or intended for revenge | Synonyms: revengeful, vengeful |
| violative | (adjective) violating or tending to violate or offend against | Synonyms: offensive |
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| vituperative | (adjective) marked by harshly abusive criticism | Synonyms: scathing |
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| vocative | (adjective) relating to a case used in some languages | - |
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| votive | (adjective) dedicated in fulfillment of a vow | - |
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