| unnameable | (adjective) too sacred to be uttered | Synonyms: ineffable, unspeakable, unutterable |
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| unnamed | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unidentified, unknown |
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| unnatural | (adjective) not in accordance with or determined by nature; contrary to nature | - |
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| (adjective) not normal; not typical or usual or regular or conforming to a norm | Synonyms: abnormal |
| (adjective) speaking or behaving in an artificial way to make an impression | Synonyms: affected |
| unnaturalised | (adjective) not having acquired citizenship | Synonyms: unnaturalized |
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| unnaturalized | (adjective) not having acquired citizenship | Synonyms: unnaturalised |
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| unnavigable | (adjective) incapable of being navigated | - |
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| unnecessary | (adjective) not necessary | Synonyms: unneeded |
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| unneeded | (adjective) not necessary | Synonyms: unnecessary |
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| unneighborly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighbourly |
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| unneighbourly | (adjective) not exhibiting the qualities expected in a friendly neighbor | Synonyms: unneighborly |
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| unnerved | (adjective) deprived of courage and strength | - |
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| unnerving | (adjective) inspiring fear | Synonyms: formidable, redoubtable |
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| unneurotic | (adjective) not neurotic | - |
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| unnotched | (adjective) having no notches | Synonyms: untoothed |
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| unnoted | (adjective) not taken into account | Synonyms: overlooked, unmarked |
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| unnoticeable | (adjective) not noticeable; not drawing attention | - |
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| (adjective) not drawing attention | Synonyms: obscure |
| unnoticed | (adjective) not noticed | - |
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| unnourished | (adjective) not nourished | - |
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| unnumberable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumbered, unnumerable |
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| unnumbered | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumerable |
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| unnumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered |
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