-kē, -ki adjective
or whacky ˈ(h)w- ; also wack·ey or wack·ie ˈw-
( wackier or whackier ; wackiest or whackiest )
Etymology: perhaps from English dialect whacky fool, from whack -head fool, literally, one who has been whacked on the head + English -y
: eccentric or irrational especially in an amusing, absurd, or fantastic manner
his somewhat wacky philosophy pervades the family life — E.E.Calkins
that explanation was just as wacky as many others — R.M.Blough
broadly : crazy , insane
if she kept on with such illogical ideas … she would end up as wacky as the other patients — Nancy Hale