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doofus

or du·fus

[doo-fuh s]
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noun, plural doo·fus·es.
  1. Slang. a foolish or inept person.
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Compare goofus.

Origin of doofus

1960–65, Americanism; probably alteration of earlier goofus in same sense
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for doofus

doofus

noun
  1. informal, mainly US a slow-witted or stupid person
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Word Origin

C20: from Black slang
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

Word Origin and History for doofus

n.

student slang, "dolt, idiot, nerd," by 1960s. "Dictionary of American Slang" says "probably related to doo-doo and goofus."

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Online Etymology Dictionary, © 2010 Douglas Harper