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crack
crack climbing
crack cocaine
crack down
crack house
crack onto
crack up
crack-up
crackbrained
crackdown
cracked
cracked wheat
cracker
cracker-barrel
crackerjack
crackers
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crackbrained
crack·brained [ krák bràynd ]


adjective 
Definition:
 
irrational: extremely irrational or eccentric ( informal )
a crackbrained idea
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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