unacceptable

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'”

(used of persons or their behavior) not acceptable or reasonable.

Not acceptable; not welcome.

“a word unacceptable in polite society”

“an unacceptable violation of personal freedom”

Not adequate to give satisfaction.

“the coach told his players that defeat was unacceptable”