| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| unassignable | (adjective) incapable of being transferred | Synonyms: nontransferable, untransferable |
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| unassigned | (adjective) not assigned | - |
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| unassisted | (adjective) lacking help | - |
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| (adjective) unsupported by other people | Synonyms: single-handed, unbacked |
| unassuming | (adjective) not arrogant or presuming | Synonyms: retiring |
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| unassured | (adjective) lacking boldness or confidence | - |
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| unbiassed | (adjective) characterized by a lack of partiality | Synonyms: indifferent, unbiased |
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| (adjective) without bias | Synonyms: unbiased |
| unclassifiable | (adjective) not possible to classify | - |
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| unclassified | (adjective) not arranged in any specific grouping | - |
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| (adjective) not subject to a security classification | - |
| uncompassionate | (adjective) lacking compassion or feeling for others | - |
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| underclass | (adjective) belonging to the lowest and least privileged social stratum | - |
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| unembarrassed | (adjective) not embarrassed | Synonyms: unabashed |
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| unimpassioned | (adjective) free from emotional appeal; marked by reasonableness | - |
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| unpassable | (adjective) incapable of being passed | Synonyms: impassable |
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| unreassuring | (adjective) not reassuring; tending to cause anxiety | Synonyms: worrisome |
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| unsurpassable | (adjective) not to be exceeded | - |
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| unsurpassed | (adjective) not capable of being improved on | Synonyms: unexceeded, unexcelled |
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