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Definitions

unacceptable

ADJECTIVE
not suitable or satisfactory
Synonyms
STRONGEST
distasteful improper inadmissible objectionable offensive repugnant undesirable unsatisfactory
WEAK
below par damaged disagreeable displeasing exceptionable half-baked ill-favored insupportable lousy not up to snuff obnoxious reject unappealing uninviting unpleasant unwanted unwelcome won't do
Antonyms
STRONGEST
acceptable agreeable appropriate good nice pleasant pleasing
WEAK
OK desirable satisfactory suitable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"This form of AI use is harmful and unacceptable," the Vitiligo Society told AFP.

From Barron's • Mar. 27, 2026

Murray also said Dean's suspension centred on an undisclosed social media account during vetting, and referred to comments therein as "unacceptable".

From BBC • Mar. 27, 2026

“This is unacceptable blackmail,” said Christophe Grudler, a centrist member of the European Parliament.

From The Wall Street Journal • Mar. 27, 2026

“It is unacceptable and illegal for a business to sell or dispose of these vehicles without abiding by the laws that protect servicemembers.”

From Los Angeles Times • Mar. 26, 2026

“I guess there isn’t a rule book for what might be unacceptable to do to another human being.”

From "Mockingjay" by Suzanne Collins

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.