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See more synonyms for crackbrained on Thesaurus.com
  1. foolish, senseless, or insane.
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Origin of crackbrained

First recorded in 1625–35; crackbrain + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for crackbrained

Historical Examples

  • She had no right to use such a power for the propaganda of crackbrained theories!

    The Fall of a Nation

    Thomas Dixon

  • According to Aubrey, the author was thought to be crackbrained, and lost much of his practice in consequence.

    Fathers of Biology

    Charles McRae

  • This woman was a crackbrained devotee, who spent half her time in going to mass and the other half in backbiting her neighbors.

  • People at court laughed at Teynagel and his mission, and Henry treated him as a crackbrained adventurer.

  • Nobody disputed it; or, if any one did, he was set down by the oracles of the vicinage as a crackbrained visionary.

    Thoughts on Man

    William Godwin

British Dictionary definitions for crackbrained


  1. insane, idiotic, or crazy
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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