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1. A stupid person; used to express a low opinion of someone's intelligence
   - dunce, dunderhead [informal], numskull [informal], blockhead [informal], bonehead [informal], lunkhead [N. Amer], hammerhead [informal], knucklehead [informal], loggerhead [archaic], muttonhead [informal], chowderhead [N. Amer, informal], chucklehead [informal], lamebrain [informal], pea brain [informal], numbskull [informal], bubblehead [informal], dumbhead [N. Amer, informal], clunk [N. Amer, informal], twonk [Brit, informal], dumbo [informal], lunk [N. Amer, informal]

1. Informal or slang term meaning insane, strange, eccentric or stupid
   - balmy [archaic, slang], barmy [slang], bats [slang], batty [slang], bonkers [slang], buggy [N. Amer, slang], cracked [slang], crackers [slang], daft [Brit, slang], dotty [slang], fruity [slang], haywire [slang], kooky [slang], kookie [slang], loco [slang], loony [slang], loopy [slang], nuts [slang], nutty [slang], round the bend [slang], around the bend [slang], wacky [slang], whacky [slang], doolally [Brit, slang], dippy [slang], daffy [slang], nutsy [N. Amer, slang], potty [Brit, slang], daft as a brush [Brit, slang], round the twist [Brit, slang], wacko [slang], bughouse [N. Amer, slang], cuckoo [slang], mental [slang], barking mad [Brit, slang], barking [Brit, slang]

Derived forms: dumbasses

See also: insane

Type of: dolt [informal], dullard, meatball [N. Amer, informal], pillock [Brit, informal], pudden-head [US, informal], pudding head [informal], stupe [N. Amer, informal], stupid, stupid person

Encyclopedia: Dumbass