plural no-no's or no-nos
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.
Leave the seashells on Sardinia’s seashore On the Italian island of Sardinia, beachcombing is a no-no. The Washington Post, San Diego Union-Tribune, 6 Apr. 2025 Each time Amelia presses forward, Simone practically begs her to stop — a big no-no when your patient is awake and listening. Laura Bradley, Vulture, 4 Apr. 2025 Unfortunately, that's a big no-no for Southerners across the board. Catherine Jessee, Southern Living, 29 Mar. 2025 And the grass was synthetic, which was also a no-no for a World Cup. Kevin Baxter, Los Angeles Times, 26 Mar. 2025 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 15 Apr. 2025.

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!