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Definition of Crackbrained
1. Adjective. Insanely irresponsible. "An idiotic idea" 
Definition of Crackbrained
1. a. Having an impaired intellect; whimsical; crazy.
Definition of Crackbrained
1. [adj]
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1. Adjective. Insanely irresponsible. "An idiotic idea" 
1. a. Having an impaired intellect; whimsical; crazy.
1. [adj]