crackbrain

Also found in: Idioms.

crack·brain

 (krăk′brān′)
n.
A foolish or eccentric person.
crack′brained′ adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

crackbrain

(ˈkrækˌbreɪn)
n
a person who is insane
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

crack•brain

(ˈkrækˌbreɪn)

n.
a foolish or senseless person.
[1560–70]
crack′brained`, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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.
View in context
ALDONZA (with sudden violence): Your master's a crackbrain!
Yo, Don quijote
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