| unceasing | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, perpetual, unremitting |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, eternal, everlasting, perpetual, unending |
| uncensored | (adjective) not subject to censorship | - |
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| unceremonial | (adjective) without ceremony or formality | Synonyms: unceremonious |
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| unceremonious | (adjective) without due formalities | - |
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| (adjective) without ceremony or formality | Synonyms: unceremonial |
| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertified | (adjective) lacking requisite official documentation or endorsement | - |
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