Synonyms of unacceptable in English:

unacceptable


See definition of unacceptable

adjective

1‘four boys have been suspended for unacceptable behaviour’

SYNONYMS
intolerable, insufferable, unsatisfactory, impermissible, inadmissible, inappropriate, unsuitable, undesirable, unreasonable, objectionable, insupportable
offensive, obnoxious, disagreeable, disgraceful, deplorable, terrible, distasteful, displeasing, improper, unseemly, beyond the pale, bad, poor
informal not on, a bit much, out of order, out, not quite the done thing, too much
British informal a bit thick, a bit off, off, not cricket
Australian, New Zealand informal over the fence
rare exceptionable, condemnable
ANTONYMS

acceptable, satisfactory