- foolish, senseless, or insane.
Origin of crackbrained
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for crackbrained
She had no right to use such a power for the propaganda of crackbrained theories!The Fall of a Nation
According to Aubrey, the author was thought to be crackbrained, and lost much of his practice in consequence.Fathers of Biology
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.The Life of John of Barneveld, 1609-15, Volume I.
John Lothrop Motley
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
- insane, idiotic, or crazy