plural no-no's or no-nos
Synonyms of no-nonext
1
: something unacceptable or forbidden
2

Examples of no-no in a Sentence

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.
In most cases, pouring water over a frozen windshield is a major no-no! Terry Baddoo, USA Today, 24 Jan. 2026 Eggs Leaving eggs in your car is a no-no in any weather conditions. Elissa Robinson, Detroit Free Press, 23 Jan. 2026 Here's when spring officially starts Eggs Leaving eggs in your car is a no-no in any weather conditions. Elissa Robinson, Freep.com, 22 Jan. 2026 Just remember that polyester fiberfill and shredded foam are a no-no in a compost bin. Mary Marlowe Leverette, The Spruce, 16 Jan. 2026 See All Example Sentences for no-no

Word History

First Known Use

circa 1942, in the meaning defined at sense 1

Time Traveler
The first known use of no-no was circa 1942

Browse Nearby Words

Cite this Entry

“No-no.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/no-no. Accessed 30 Jan. 2026.

Kids Definition

no-no

noun
ˈnō-ˌnō
plural no-no's or no-nos
: something that is unacceptable or forbidden

More from Merriam-Webster on no-no

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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