#1 wicked a. morally bad in principle or practice. wn #2 wicked s. [sinful, unholy] having committed unrighteous acts; "a sinful person". wn #3 wicked s. [arch, impish, implike, mischievous, pixilated, prankish, puckish] naughtily or annoyingly playful; "teasing and worrying with impish laughter"; "a wicked prank". wn