unacceptable

Something unacceptable is not okay — it's objectionable or displeasing. Hey, are you yelling in the library? That's unacceptable!

If a student's behavior is unacceptable, she may get detention or be sent to the principal's office. And if a restaurant patron's meal is unacceptable, he has every right to ask his server for something else. The adjective unacceptable adds the "not" prefix un- to acceptable, "suitable, adequate, or pleasing." We can trace the roots back to the Latin acceptare, "take or receive willingly."

Definitions of unacceptable
1

adj not acceptable; not welcome

“a word unacceptable in polite society”
“an unacceptable violation of personal freedom”
Synonyms:
exceptionable, objectionable
liable to objection or debate; used of something one might take exception to
unsatisfactory
not giving satisfaction
unwelcome
not welcome; not giving pleasure or received with pleasure
Antonyms:
acceptable
worthy of acceptance or satisfactory
bankable
acceptable to or at a bank
unexceptionable, unimpeachable
completely acceptable; not open to exception or reproach
unobjectionable
not objectionable
satisfactory
giving satisfaction
show more antonyms...

adj used of persons or their behavior

Synonyms:
impossible, insufferable, unsufferable
intolerable, unbearable, unendurable
incapable of being put up with

adj not adequate to give satisfaction

“the coach told his players that defeat was unacceptable
Synonyms:
unsatisfactory
not giving satisfaction

adj not conforming to standard usage

“the following use of `access' was judged unacceptable by a panel of linguists”
Synonyms:
unaccepted
nonstandard
not conforming to the language usage of a prestige group within a community

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