crackbrain

noun
crack·brain | \ ˈkrak-ˌbrān \

Definition of crackbrain 

: an erratic person : crackpot

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Other words from crackbrain

crackbrained \ˈkrak-ˈbrānd \ adjective

Examples of crackbrain in a Sentence

once a brilliant dancer, he died a crackbrain in a mental institution a crackbrain who wore bedroom slippers to the grocery shop

First Known Use of crackbrain

circa 1570, in the meaning defined above

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The first known use of crackbrain was circa 1570

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