rattlebrain

noun

noun

Etymology From rattle + brain.

A rattlebrained person.

a genial young fellow enough to look at, and something of a rattlebrain, to all appearance.1924, Herman Melville, chapter 13, in Billy Budd, London: Constable & Co.:
My mother, peace be with her, when she called me a rattlebrain, was right.1962, Isaac Bashevis Singer, translated by Isaac Bachevis Singer and Cecil Hemley, The Slave, New York: Farrar, Straus & Giroux, published 1985, Part III, p. 297:

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