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Definition of wacko:

Synonyms for wacko:

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