| unobjectionable | (adjective) (of behavior or especially language) free from objectionable elements; fit for all observers | Synonyms: clean |
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| (adjective) not objectionable | - |
| (adjective) not causing disapproval | Synonyms: innocuous |
| unobjective | (adjective) (of e.g. evidence) not objective or easily verified | Synonyms: unverifiable |
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| unobligated | (adjective) not obligated | - |
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| unobliging | (adjective) not accommodating | Synonyms: unaccommodating |
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| unobservable | (adjective) not accessible to direct observation | - |
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| unobservant | (adjective) not consciously observing | Synonyms: unseeing |
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| unobserved | (adjective) unnoticed | Synonyms: unseen |
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| unobstructed | (adjective) free from impediment or obstruction or hindrance | - |
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| unobtainable | (adjective) not capable of being obtained | Synonyms: inaccessible, unprocurable, untouchable |
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| unobtrusive | (adjective) not obtrusive or undesirably noticeable | - |
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| unobvious | (adjective) not immediately apparent | - |
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| unoccupied | (adjective) not held or filled or in use | - |
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| (adjective) not seized and controlled | - |
| (adjective) not leased to or occupied by a tenant | Synonyms: untenanted |
| unoffending | (adjective) not offending | - |
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| (adjective) not causing anger or annoyance | Synonyms: inoffensive |
| unofficial | (adjective) not having official authority or sanction | - |
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| (adjective) not officially established | - |
| 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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