Synonyms for Playful (same or very similar meaning)
WordNet sense 1 (playfully vexing (especially by ridicule)):
teasingWordNet sense 2 (playful like a lively kitten):
frisky, kittenishWordNet sense 3 (naughtily or annoyingly playful):
impish, mischievousWordNet sense 4 (given to merry frolicking):
frolicsome, sportiveFrom the ODE community, based on WordNetadd/edit