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unacceptable has 2 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is acceptable.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
not acceptable; not welcome
“a word unacceptable in polite society”
(used of persons or their behavior) not acceptable or reasonable
“impossible behavior”
not conforming to standard usage
“the following use of `access' was judged unacceptable by a panel of linguists; `You can access your cash at any of 300 automatic tellers'”
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for unacceptable.
Synonyms, antonyms and the broader and narrower relations for unacceptable come from Princeton University’s WordNet. Full sources and licences.