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lamebrain

[leym-breyn]
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noun Informal.
  1. a dunce; booby; fool.

Origin of lamebrain

First recorded in 1925–30; lame1 + brain
Related formslame·brained, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for lamebrained

lamebrain

noun
  1. informal a stupid or slow-witted 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