- anything that is forbidden or not advisable, as because of being improper or unsafe: If you want to lose weight, rich desserts are a no-no.
Origin of no-no
1940–45, Americanism; reduplication of no1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for no-no
Not all scientists agree that artificial sweeteners are a no-no when it comes to your health and diet.Are Artificial Sweeteners Wrecking Your Diet?
September 30, 2014
Converting at birth the children of non-Jewish mothers is now a no-no.In Italy, a Traditional Jewish Lifestyle is Disappearing
December 13, 2013
The point is, nobody knows what's next on the Hamas no-no list, which is almost always enforced before it is pronounced.Hamas: The Palestinian Fashion Police
April 9, 2013
Raising taxes is a no-no with Grover, so that leaves raising the eligibility age.How to Make Seniors Suspicious of Ryan and Romney
August 22, 2012
This is a no-no in the LDS church, to say the least, and as a result Scott spent a year or so “disfellowshipped” for his sins.Turning Spotlight on Mitt Romney Siblings Could Help Humanize GOP Nominee
May 30, 2012
They're going to take No-no home, then we're all going to the movies.Ruggles of Red Gap
Harry Leon Wilson
"No-no; I thought of that myself, and Nemu too advised it," cried Ani.Uarda, Complete
No-no, that won't do; you mustn't talk, and you mustn't retch and gag that way, either—you'll wake up your poor brother.Those Extraordinary Twins
Mark Twain (Samuel Clemens)
Word Origin and History for no-no
1942, from reduplication of no.
Online Etymology Dictionary, © 2010 Douglas Harper