noun Slang.

a stupid or slow-thinking person.

Origin of dimwit

An Americanism dating back to 1920–25; dim + wit1
Related formsdim·wit·ted, adjectivedim·wit·ted·ly, adverbdim·wit·ted·ness, noun

Synonyms for dimwit

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for dimwit



informal a stupid or silly person
Derived Formsdim-witted, adjectivedim-wittedly, adverbdim-wittedness, noun
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 dimwit

also dim-wit, U.S. college slang by 1922, from dim (adj.) + wit (n.). Related: dimwitted.

Online Etymology Dictionary, © 2010 Douglas Harper