/ Dictionary / Index M muttonhead: Meaning and Definition of Find definitions for: mut•ton•head Pronunciation: (mut'n-hed"), [key] — n. Informal. a slow-witted, foolish, or stupid person; dolt. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: muttonhead (Thesaurus) muttonfish mutton snapper Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language