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Definition of crackbrained:

Synonyms for crackbrained:

certifiable, bats, meshuga, unhinged, crazed, imbecilic, loony tunes, scatty, psychotic, deranged, wacky, childish, wud, brainsick, barmy, bedlam, ludicrous, non compos mentis, crazy, daffy, nutty, crackpot, demented, daft, idiotic, lunatic, kooky, mad, loco, ridiculous, laughable, batty, over-the-top, nuts, screwy, maniacal, cuckoo, mental, cracked, unsound, crackers, psycho, gaga, bughouse, imbecile, loony, absurd, moonstruck, cranky, insane, fruity, not in your right mind/not right in the head, derisory, bonkers, nonsensical, silly, haywire, wacko, cockeyed, unbalanced, balmy, preposterous.

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