Definition of crackbrained adjective from the Oxford Advanced Learner's Dictionary

 

crackbrained

 adjective
adjective
BrE BrE//ˈkrækbreɪnd//
 
; NAmE NAmE//ˈkrækbreɪnd//
 
(informal) Describing strange traits
 
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crazy and unlikely to succeed a crackbrained idea See related entries: Describing strange traits
See the Oxford Advanced American Dictionary entry: crackbrained