dumb-ass

or dumb·ass

[ duhm-as ]
/ ˈdʌmˌæs /

noun Slang: Vulgar.

a thoroughly stupid person; blockhead.

Origin of dumb-ass

1970–75; Americanism

British Dictionary definitions for dumb-asses

dumb-ass
/ slang /

noun

a stupid person

adjective

extremely stupid