/ Dictionary / Index H hairbrained: Meaning and Definition of Find definitions for: hair•brained Pronunciation: (hâr'brānd"), [key] — adj. harebrained. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hairball hairbreadth Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language