| unaccented | (adjective) (used of syllables) carrying no stress | Synonyms: atonic |
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| (adjective) (used of vowels or syllables) pronounced with little or no stress | Synonyms: light, weak |
| unacceptable | (adjective) not acceptable; not welcome | - |
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| (adjective) (used of persons or their behavior) not acceptable or reasonable | Synonyms: impossible |
| (adjective) not conforming to standard usage | Synonyms: unaccepted |
| (adjective) not adequate to give satisfaction | - |
| unaccepted | (adjective) not conforming to standard usage | Synonyms: unacceptable |
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| unaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: inaccessible |
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| unaccommodating | (adjective) not accommodating | Synonyms: unobliging |
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| (adjective) offering no assistance | - |
| unaccompanied | (adjective) being without an escort | - |
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| (adjective) playing or singing without accompaniment | - |
| (adjective) (of a state or an event) taking place without something specified occurring at the same time | - |
| unaccountable | (adjective) not to be accounted for or explained | Synonyms: unexplainable |
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| (adjective) free from control or responsibility | - |
| unaccredited | (adjective) lacking official approval | Synonyms: unlicenced, unlicensed |
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| unaccustomed | (adjective) unusual or unfamiliar | - |
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| unachievable | (adjective) impossible to achieve | Synonyms: unattainable, undoable, unrealizable |
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| unacknowledged | (adjective) not recognized or admitted | - |
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| (adjective) not openly acknowledged | - |
| unacquainted | (adjective) having little or no knowledge of | Synonyms: unacquainted with, unfamiliar with |
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| (adjective) not knowledgeable about something specified | Synonyms: innocent |
| unacquisitive | (adjective) not acquisitive; not interested in acquiring or owning anything | - |
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| unactable | (adjective) not actable | - |
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