Meaning of “unacceptable” - Learner’s Dictionary

unacceptable

adjective uk us /ˌʌnəkˈseptəbl/

B2 too bad to be allowed to continue:

The water contains unacceptable levels of pollution.
I find that sort of behaviour completely unacceptable.
unacceptably adverb

(Definition of “unacceptable” from the Cambridge Learner’s Dictionary © Cambridge University Press)