Oxford Advanced American Dictionary

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

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unacceptable

adjective
unacceptable pronunciation English ˌʌnəkˈseptəbl unacceptable pronunciation American ˌʌnəkˈseptəbl
 
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
acceptableunacceptably
unacceptably pronunciation English ˌʌnəkˈseptəbli unacceptably pronunciation American ˌʌnəkˈseptəbli
adverbunacceptably high levels of unemployment