unacceptable
un-ac-cept-a-ble
adjective
Too bad or wrong to be allowed, tolerated, or approved of.
"His rude behaviour was completely unacceptable."
Thesaurus
Synonyms: intolerable, impossible, unbearable, unendurable, unaccepted, nonstandard, objectionable, exceptionable, unsatisfactory
Antonyms: acceptable