| unalarming | (adjective) not alarming; assuaging alarm | - |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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| unalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: inalienable |
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| unalike | (adjective) not alike or similar | Synonyms: dissimilar |
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| unalloyed | (adjective) free from admixture | - |
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| unalterability | (noun) the quality of not being alterable | - |
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| (noun) the quality of being fixed and unchangeable | Synonyms: fixedness |
| unalterable | (adjective) not capable of being changed or altered | Synonyms: inalterable |
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| (adjective) of a sentence; that cannot be changed | - |
| (adjective) remaining the same for indefinitely long times | Synonyms: changeless |
| unalterably | (adverb) in an unalterable and unchangeable manner | Synonyms: immutably, unassailably, unchangeably |
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| unaltered | (adjective) remaining in an original state | Synonyms: unchanged |
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