| 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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