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.
Today, this kind of wildlife encounter would be a big no-no for safety reasons. Christine Peterson, Wired News, 5 July 2025 This is a huge no-no in Colorado, where reserving a traditional campsite is akin to scoring Taylor Swift tickets. Frederick Dreier, Outside Online, 26 June 2025 Buying a dusty old bottle off a walk-in from your attic is definitely a no-no. Seth Eli Barlow, Arkansas Online, 24 June 2025 No Cutting or Damaging Plants That Are For Sale Breaking off pieces from intact plants that are for sale is a big no-no. Leanne Potts, Better Homes & Gardens, 21 June 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

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Cite this Entry

“No-no.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/no-no. Accessed 15 Jul. 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

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