| unkemptness | (noun) a lack of order and tidiness; not cared for | Synonyms: sloppiness, slovenliness |
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| unkindness | (noun) lack of sympathy | - |
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| unknowing | (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, nescience, unknowingness |
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| unknowingness | (noun) unconsciousness resulting from lack of knowledge or attention | Synonyms: unawareness |
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| (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, nescience, unknowing |
| unknown | (noun) a variable whose values are solutions of an equation | Synonyms: unknown quantity |
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| (noun) an unknown and unexplored region | Synonyms: terra incognita, unknown region |
| (noun) anyone who does not belong in the environment in which they are found | Synonyms: alien, stranger |