Definition of unacceptable adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌʌnəkˈseptəbl//
; NAmE NAmE//ˌʌnəkˈseptəbl//
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that you cannot accept, allow or approve of Such behaviour is totally unacceptable in a civilized society. Noise from the factory has reached an unacceptable level. opposite acceptableExtra examples Most people would consider such risks wholly unacceptable. Such a solution would be quite unacceptable to the majority of people. The cost of these proposed changes makes them unacceptable. There is nothing inherently unacceptable in these proposals. socially unacceptable behaviour socially unacceptable conduct Raising taxes now would be politically unacceptable.
See the Oxford Advanced American Dictionary entry: unacceptable