unacceptable

adjective

un·​ac·​cept·​able ˌən-ik-ˈsep-tə-bəl How to pronounce unacceptable (audio)
-ak-
Synonyms of unacceptablenext
: not acceptable : not pleasing or welcome
unacceptability noun
unacceptably adverb

Examples of unacceptable in a Sentence

a word that is unacceptable in formal English Some of her ideas were unacceptable to other people.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This is unconstitutional and unacceptable. Claire Heddles, Miami Herald, 28 Mar. 2026 The unacceptable has become acceptable. Scott Roxborough, HollywoodReporter, 26 Mar. 2026 To ignore a statute already on the books to get our sickest into lifesaving treatment is unacceptable and an abdication of authority. U T Readers, San Diego Union-Tribune, 26 Mar. 2026 The takeover will continue until the district meets criteria set by the Texas Education Agency, which include exceeding the state and/or regional average for meeting-grade-level proficiency in reading and math, and ensuring the district has no schools unacceptable ratings for multiple years. Lina Ruiz, Fort Worth Star-Telegram, 24 Mar. 2026 See All Example Sentences for unacceptable

Word History

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of unacceptable was in the 15th century

Browse Nearby Words

Cite this Entry

“Unacceptable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unacceptable. Accessed 2 Apr. 2026.

Kids Definition

unacceptable

adjective
un·​ac·​cept·​able ˌən-ik-ˈsep-tə-bəl How to pronounce unacceptable (audio)
-ak-
: not acceptable : not pleasing or welcome
unacceptably adverb

More from Merriam-Webster on unacceptable

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster