American Heritage Dictionary
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Century Dictionary
GNU Webster's 1913
WordNet
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Elsewhere on the web
Why, Jack, Jack, what a thoughtless, rattlebrained chap you are.— Jack Harkaway's Boy Tinker Among The Turks Book Number Fifteen in the Jack Harkaway Series
Through a rattlebrained friend of theirs, one Nancy Spencer, they agree to take a boy from the Hopeton— Why the Chimes Rang: A Play in One Act
"But I am afraid you are glorifying two rattlebrained chaps who should be in a home for imbeciles instead of in the castle their audacity might have blighted.— Graustark

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