| unkempt | (adjective) not neatly combed | - |
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| (adjective) not properly maintained or cared for | - |
| unkept | (adjective) (especially of promises or contracts) having been violated or disregarded | Synonyms: broken |
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| unkeyed | (adjective) characterized by avoidance of traditional western tonality | Synonyms: atonal |
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| unkind | (adjective) lacking kindness | - |
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| (adjective) deficient in humane and kindly feelings | Synonyms: pitiless |
| unkindled | (adjective) not set afire | - |
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| unkindly | (adjective) lacking in sympathy and kindness | Synonyms: unsympathetic |
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| unknowable | (adjective) not knowable | - |
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| unknowing | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowledgeable, unwitting |
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| unknowledgeable | (adjective) unaware because of a lack of relevant information or knowledge | Synonyms: ignorant, unknowing, unwitting |
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| unknown | (adjective) not known | - |
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| (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unnamed |
| (adjective) not famous or acclaimed | Synonyms: obscure, unsung |
| (adjective) not known before | Synonyms: strange |
| (adjective) not known to exist | - |