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

Related Adjective(s):impossible

2.Definition: not acceptable; not welcome

"A word unacceptable in polite society", "An unacceptable violation of personal freedom"

3.Definition: not adequate to give satisfaction

"The coach told his players that defeat was unacceptable"

4.Definition: 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'"

Related Adjective(s):unaccepted