crackbrain


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crack·brain

 (krăk′brān′)
n.
A foolish or eccentric person.

crack′brained′ adj.

crackbrain

(ˈkrækˌbreɪn)
n
a person who is insane

crack•brain

(ˈkrækˌbreɪn)

n.
a foolish or senseless person.
[1560–70]
crack′brained`, adj.
References in classic literature ?
To be sure, I would tell him how kindly I had myself been used upon that dry land he was so much afraid of, and how well fed and carefully taught both by my friends and my parents: and if he had been recently hurt, he would weep bitterly and swear to run away; but if he was in his usual crackbrain humour, or (still more) if he had had a glass of spirits in the roundhouse, he would deride the notion.
ALDONZA (with sudden violence): Your master's a crackbrain!
Even earlier came the phrase crack-brained to mean insanity ("Such a crackbrain as thou art," 1570).