dumb-ass

or dumb·ass

[ duhm-as ]
/ ˈdʌmˌæs /

noun Slang: Vulgar.

a thoroughly stupid person; blockhead.

Origin of dumb-ass

1970–75; Americanism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for dumbass

dumb-ass

/ slang /

noun

a stupid person

adjective

extremely stupid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012