/ Dictionary / Index N nervous breakdown: Meaning and Definition of Find definitions for: nerv'ous break'down Pronunciation: [key] (not in technical use) any disabling mental disorder requiring treatment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nervous nervous exhaustion Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language