[adj] not acceptable; not welcome; "a word unacceptable in polite society"; "an unacceptable violation of personal freedom"
[adj] not adequate to give satisfaction; "the coach told his players that defeat was unacceptable"
[adj] (linguistics) not conforming to standard usage; "the following use of `access' was judged unacceptable by a panel of linguists; `You can access your cash at any of 300 automatic tellers'"
[adj] used of persons or their behavior; "impossible behavior"; "insufferable insolence"