WordNet sense 1 (naughtily or annoyingly playful):

impish, puckish, wicked, pixilated, implike, prankish, wicked

WordNet sense 2 (full of fun and high spirits):

playful

WordNet sense 3 (causing or capable of causing harm):

harmful

WordNet sense 4 (badly behaved):

naughty

WordNet sense 5 (having undesirable or negative qualities):

bad