kooky(adjective) adjective1. strange or foolish; crazy.Similar word(s): insane, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, loony, loopy, nuts, nutty, wacky, whackySentences with kooky as an adjective:- his kooky behavior seemed charming at first