that you cannot accept, allow, or approve of Such behavior is totally unacceptable in a civilized society. Noise from the factory has reached an unacceptable level. opposite acceptable
NAmE//ˌʌnəkˈsɛptəbli//
adverb unacceptably high levels of unemploymentSee unacceptable in the Oxford Advanced Learner's DictionaryCheck pronunciation: unacceptable