| unknot | (verb) become or cause to become undone by separating the fibers or threads of | Synonyms: unpick, unravel, unscramble, untangle |
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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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| (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, nescience, unknowingness |
| unknowingly | (adverb) without knowledge or intention | Synonyms: inadvertently, unwittingly |
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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 |
| 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 | - |
| (noun) a variable whose values are solutions of an equation | Synonyms: unknown quantity |
| (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 |