unacceptable
Britishadjective
-
not satisfactory; inadequate
the standard was wholly unacceptable
-
intolerable
hitting children is unacceptable
Explanation
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."
Vocabulary lists containing unacceptable
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.
Politically, however, much higher fuel prices would be unacceptable for the Kremlin.
From MarketWatch • Jul. 7, 2026
In their grievance letter, the detainees called the markups an unacceptable business practice with no apparent limit.
From Los Angeles Times • Jul. 1, 2026
“Iran’s attacks on Bahrain were unacceptable, and the United States stands with the people and government of Bahrain.”
From The Wall Street Journal • Jun. 26, 2026
In Italy, courts in Palermo, Sicily, said they were suspending all non-urgent hearings until June 29 due to "malfunctioning air conditioning" while teaching unions in France called for strike action over "unacceptable working conditions".
From Barron's • Jun. 25, 2026
“This is unacceptable, Odenigbo! You owe her an apology!”
From "Half of a Yellow Sun" by Chimamanda Ngozi Adichie
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
