/ Dictionary / Index F fatheaded: Meaning and Definition of Find definitions for: fat•head•ed Pronunciation: (fat'hed"id), [key] — adj. foolish; fatuous; witless. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fatheaded (Thesaurus) fathead fathead minnow Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language