adj.
Variant: also whacky
Pronunciation: ' wa-k ē
Function: adjective
Inflected Form: wack · i · er ; -est
Etymology: perhaps from English dialect whacky fool
Date: circa 1935
: absurdly or amusingly eccentric or irrational : CRAZY < wacky ideas> <a wacky comedian>
– wack · i · ly \ ' wa-k ə -l ē \ adverb
– wack · i · ness \ ' wa-k ē -n ə s \ noun