Mutt | Definition of mutt by Merriam-Webster

Full Definition of MUTT

1

: a stupid or insignificant person : fool

2

: a mongrel dog : cur

See mutt defined for English-language learners

See mutt defined for kids

short for muttonhead dull-witted person

First Known Use: 1899

Synonyms: airhead, birdbrain, blockhead, bonehead, bubblehead, chowderhead, chucklehead, clodpoll (or clodpole), clot [British], cluck, clunk, cretin, cuddy (or cuddie) [British dialect], deadhead, dim bulb [slang], dimwit, dip, dodo, dolt, donkey, doofus [slang], dope, dork [slang], dullard, dumbbell, dumbhead, dum-dum, dummkopf, dummy, dunce, dunderhead, fathead, gander, golem, goof, goon, half-wit, hammerhead, hardhead, ignoramus, imbecile, jackass, know-nothing, knucklehead, lamebrain, loggerhead [chiefly dialect], loon, lump, lunkhead, meathead, mome [archaic], moron, mug [chiefly British], idiot, natural, nimrod [slang], nincompoop, ninny, ninnyhammer, nit [chiefly British], nitwit, noddy, noodle, numskull (or numbskull), oaf, pinhead, prat [British], ratbag [chiefly Australian], saphead, schlub (also shlub) [slang], schnook [slang], simpleton, stock, stupe, stupid, thickhead, turkey, woodenhead, yahoo, yo-yo

: a dog that is a mix of usually undetermined breeds

Next Word in the Dictionary: mutterPrevious Word in the Dictionary: mutismAll Words Near: mutt

What made you want to look up mutt? Please tell us where you read or heard it (including the quote, if possible).