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dumb-ass

American  
[duhm-as] / ˈdʌmˌæs /
Or dumbass

noun

Slang: Vulgar.
  1. a thoroughly stupid person; blockhead.


dumb-ass British  

noun

  1. a stupid person

"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

adjective

  1. 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

Etymology

Origin of dumb-ass

1970–75;