| unattached | (adjective) not associated in an exclusive sexual relationship | Synonyms: uncommitted |
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| (adjective) not fastened together | - |
| (adjective) (of animals) able to swim about; not attached | Synonyms: free-swimming |
| unattackable | (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unassailable |
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| unattainable | (adjective) impossible to achieve | Synonyms: unachievable, undoable, unrealizable |
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| unattended | (adjective) lacking accompaniment or a guard or escort | - |
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| (adjective) lacking a caretaker | Synonyms: neglected |
| (adjective) not watched | - |
| unattired | (adjective) having removed clothing | Synonyms: unappareled, unclad, undressed, ungarbed, ungarmented |
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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 |
| unattributable | (adjective) not attributable | Synonyms: unascribable |
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| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |
| unavailable | (adjective) not available or accessible or at hand | - |
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| unavailing | (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, otiose |
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| unavenged | (adjective) for which vengeance has not been taken | - |
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| unavoidable | (adjective) impossible to avoid or evade | Synonyms: ineluctable, inescapable |
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| unavowed | (adjective) not openly expressed | Synonyms: sneaking |
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| (adjective) not openly made known | Synonyms: secret |
| (adjective) not affirmed or mentioned or declared | - |
| unawakened | (adjective) not aroused or activated | - |
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| (adjective) still asleep | - |
| unaware | (adjective) (often followed by `of') not aware | Synonyms: incognizant |
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| unawed | (adjective) not awed | - |
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