unacceptable has definitions from the field of linguistics
1
[ adjective ] not adequate to give satisfaction

Examples

: "the coach told his players that defeat was unacceptable"

Used in print

(Edward E. Kelly, S.J., "Christian Unity in England"...)

Representing as_it_did the efforts of only unauthorized individuals of the Roman and Anglican_Churches , and urging a communion of prayer unacceptable to Rome , this association produced little fruit , and , in_fact , was condemned by the Holy_Office in 1864 .

Related terms

unsatisfactory

2
[ adjective ] used of persons or their behavior

Examples

"impossible behavior" "insufferable insolence"

Related terms

intolerable

3
[ adjective ] (linguistics) not conforming to standard usage

Synonyms

unaccepted

Examples

"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 terms

linguistics nonstandard

4
[ adjective ] not acceptable; not welcome

Examples

"a word unacceptable in polite society" "an unacceptable violation of personal freedom"

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