Dictionary.com

no-no

[ noh-noh ]
/ ˈnoʊˌnoʊ /
See synonyms for: no-no / no-nos on Thesaurus.com

noun, plural no-nos, no-no's.Informal.

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.

QUIZZES

LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!

Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
Question 1 of 13
How do you say “cat” 🐈 in Spanish?
gato/gata
cato/cata
gatto/gatta
TAKE THE QUIZ TO FIND OUT

Origin of no-no

1940–45, Americanism; reduplication of no1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Words related to no-no

restricted, banned, illegal, barred, illicit, contraband, unwarranted, wrongful, unofficial, unconstitutional, unlawful, unjustified, illegitimate, pirated, unapproved, obscenity, swearing, four-letter word, embargo, restriction

British Dictionary definitions for no-no

Nono
/ (Italian ˈnɔːno) /

noun

Luigi (luˈiːdʒi). 1924–90, Italian composer of 12-tone music
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012