unacceptable

adjective

1. not adequate to give satisfaction"the coach told his players that defeat was unacceptable"
2. not acceptable; not welcome"a word unacceptable in polite society"
3. (used of persons or their behavior) not acceptable or reasonable"impossible behavior"
4. 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’"