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crackbrain

[krak-breyn]
noun
  1. a foolish, senseless, or insane person.
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Origin of crackbrain

First recorded in 1560–70; crack(ed) + brain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for crackbrain

crackbrain

noun
  1. a person who is insane
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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