Longman Dictionary of Contemporary English homepage

unacceptable

 adjective
     
un‧ac‧cept‧a‧ble
something that is unacceptable is so wrong or bad that you think it should not be allowed:
I found her attitude totally unacceptable.
unacceptable levels of pollution
unacceptable to
The recommendations from this report are unacceptable to many black people.
unacceptable to do something
It was socially unacceptable to discuss sex then.
—unacceptably adverb:
Unemployment is unacceptably high.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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