| unsociable | (adjective) not inclined to society or companionship | - |
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| unsocial | (adjective) not seeking or given to association; being or living without companions | - |
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| unsoiled | (adjective) without soil or spot or stain | Synonyms: unspotted, unstained |
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| unsold | (adjective) not disposed of by purchase | - |
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| unsoldierly | (adjective) not conforming to military standards | - |
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| unsolicited | (adjective) not requested or sought | Synonyms: unasked-for |
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| unsoluble | (adjective) not easily solved | Synonyms: insolvable, unresolvable, unsolvable |
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| unsolvable | (adjective) not easily solved | Synonyms: insolvable, unresolvable, unsoluble |
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| unsolved | (adjective) not solved | Synonyms: unresolved |
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| unsophisticated | (adjective) not wise in the ways of the world | Synonyms: unworldly |
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| (adjective) awkwardly simple and provincial | Synonyms: bumpkinly, hick, rustic |
| (adjective) lacking complexity | Synonyms: uncomplicated |
| unsorted | (adjective) not categorized or sorted | Synonyms: uncategorised, uncategorized |
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| (adjective) not arranged according to size | - |
| unsought | (adjective) not desired | Synonyms: undesired |
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| unsound | (adjective) not sound financially | - |
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| (adjective) not in good condition; damaged or decayed | - |
| (adjective) suffering from severe mental illness | Synonyms: mentally ill, unstable |
| (adjective) containing or based on a fallacy | Synonyms: fallacious |
| (adjective) physically unsound or diseased | Synonyms: bad, unfit |
| (adjective) of e.g. advice | - |
| unsoundable | (adjective) too deep to determine the depth of | - |
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| unsounded | (adjective) situated at or extending to great depth; too deep to have been sounded or plumbed | Synonyms: profound, unfathomed, unplumbed |
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| (adjective) not made to sound | Synonyms: silent |
| unsoured | (adjective) not having turned bad | - |
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| unsown | (adjective) (of a piece of ground) not have a crop sown on it | Synonyms: unseeded |
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