| unimportant | (adjective) not important | - |
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| (adjective) devoid of importance, meaning, or force | Synonyms: insignificant |
| unobservant | (adjective) not consciously observing | Synonyms: unseeing |
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| unpleasant | (adjective) offensive or disagreeable; causing discomfort or unhappiness | - |
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| unrepentant | (adjective) not penitent or remorseful | Synonyms: impenitent, unremorseful |
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| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obdurate, obstinate |
| unresistant | (adjective) (often followed by `to') likely to be affected with | Synonyms: liable, nonimmune, nonresistant |
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| unreverberant | (adjective) not reverberant; lacking a tendency to reverberate | Synonyms: nonresonant |
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| unvigilant | (adjective) not alert to what is potentially dangerous | Synonyms: unalert, unwatchful |
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| vacant | (adjective) without an occupant or incumbent | - |
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| (adjective) devoid of intelligence or thought | Synonyms: mindless, vacuous |
| vacillant | (adjective) uncertain in purpose or action | Synonyms: vacillating, wavering |
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| vagrant | (adjective) continually changing especially as from one abode or occupation to another | Synonyms: aimless, drifting, floating, vagabond |
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| valiant | (adjective) having or showing valor | Synonyms: valorous |
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| variant | (adjective) differing from a norm or standard | - |
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| (adjective) exhibiting variation and change | - |
| verdant | (adjective) characterized by abundance of verdure | - |
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| vesicant | (adjective) causing blisters | Synonyms: vesicatory |
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| vibrant | (adjective) of colors that are bright and striking | - |
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| (adjective) of sounds that are strong and resonating | - |
| (adjective) vigorous and animated | Synonyms: vivacious |
| vigilant | (adjective) carefully observant or attentive; on the lookout for possible danger | Synonyms: argus-eyed, open-eyed, wakeful, watchful |
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| volant | (adjective) with wings extended in a flying position | - |
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