| unoiled | (adjective) in need of oil treatment | - |
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| (adjective) not having oil rubbed into the surface | - |
| unopen | (adjective) not open | Synonyms: closed, shut |
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| unopened | (adjective) not yet opened or unsealed | - |
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| unopposable | (adjective) not opposable | - |
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| unopposed | (adjective) not having opposition or an opponent | - |
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| unordered | (adjective) not arranged in order | Synonyms: disordered |
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| (adjective) not arranged in order hierarchically | Synonyms: ungraded, unranked |
| unorganised | (adjective) not having or belonging to a structured whole | Synonyms: unorganized |
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| (adjective) not affiliated in a trade union | Synonyms: nonunionised, nonunionized, unorganized |
| unorganized | (adjective) not having or belonging to a structured whole | Synonyms: unorganised |
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| (adjective) not affiliated in a trade union | Synonyms: nonunionised, nonunionized, unorganised |
| unoriented | (adjective) not having position or goal definitely set or ascertained | - |
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| unoriginal | (adjective) not original; not being or productive of something fresh and unusual | - |
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| unornamented | (adjective) lacking embellishment or ornamentation | Synonyms: bare, plain, spare, unembellished |
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| unorthodox | (adjective) breaking with convention or tradition | - |
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| (adjective) independent in behavior or thought | Synonyms: irregular, maverick |
| unostentatious | (adjective) not ostentatious | Synonyms: unpretending, unpretentious |
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| (adjective) exhibiting restrained good taste | Synonyms: understated, unpretentious |
| unowned | (adjective) having no owner | Synonyms: ownerless |
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| unoxygenated | (adjective) (used of blood) not supplied with oxygen | Synonyms: unaerated |
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| unpronounceable | (adjective) impossible or difficult to pronounce correctly | - |
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| (adjective) very difficult to pronounce correctly | Synonyms: unutterable |
| unsynchronous | (adjective) not occurring together | Synonyms: nonsynchronous, unsynchronised, unsynchronized |
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| venomed | (adjective) full of malice or hate | - |
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| venomous | (adjective) marked by deep ill will; deliberately harmful | Synonyms: poisonous, vicious |
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| (adjective) extremely poisonous or injurious; producing venom | Synonyms: deadly, virulent |
| venose | (adjective) having or showing markings that resemble veins | Synonyms: veined, veinlike |
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| venous | (adjective) of or contained in or performing the function of the veins | - |
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| verminous | (adjective) of the nature of vermin; very offensive or repulsive | - |
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| vertiginous | (adjective) having or causing a whirling sensation; liable to falling | Synonyms: dizzy, giddy, woozy |
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| villainous | (adjective) extremely wicked | Synonyms: nefarious |
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| vinous | (adjective) of or relating to wine | Synonyms: vinaceous |
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| vitiliginous | (adjective) of or relating to or having vitiligo | - |
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| voluminous | (adjective) large in number or quantity (especially of discourse) | Synonyms: copious |
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| (adjective) marked by repeated turns and bends | Synonyms: tortuous, twisting, twisty, winding |
| (adjective) large in volume or bulk | - |
| xenogeneic | (adjective) denoting or relating to cells or tissues from individuals belonging to different species | - |
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| xenophobic | (adjective) suffering from xenophobia; having abnormal fear or hatred of the strange or foreign | - |
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| zoonotic | (adjective) of or relating to or constituting zoonosis | - |
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