← BackshareGuessmuttonhead/ˈmʌtənˌhɛd/nounA stupid or slow-witted person; a fool.Don't be such a muttonhead — the answer is right in front of you.He called me a muttonhead for forgetting my keys again.Only a muttonhead would try to fix a leaky pipe without turning off the water.SynonymsdunceblockheadsimpletonAntonymsgenius