/ Dictionary / Index N no-no: Meaning and Definition of Find definitions for: no-no Pronunciation: (nō'nō"), [key] — pl. -nos, -no's. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonny-nonny nonobedience Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language