unacceptable

adjective

four boys have been suspended for unacceptable behaviour:

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.

unacceptable Oxford Dictionary of English