Examples from the Web for crackbrained
According to Aubrey, the author was thought to be crackbrained, and lost much of his practice in consequence.Fathers of Biology|Charles McRae
This p. 83came from a hundred children collected by a crackbrained stranger (said to be English).The Voyage Alone in the Yawl "Rob Roy"|John MacGregor
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
She had no right to use such a power for the propaganda of crackbrained theories!The Fall of a Nation|Thomas Dixon
They were of a very various kind, and no bad epitome of the mind of a gallant and crackbrained coxcomb.