kiddish

having or showing the annoying qualities (as silliness) associated with children such kiddish behavior is not appropriate in church Synonyms adolescent, babyish, immature, infantile, jejune, juvenile, childish, puerileRelated Words boyish, brattish, bratty, girlie (or girly), girlish; childlike, innocent, naive (or naïve), simple, simplistic, unsophisticatedNear Antonyms unchildlike; cosmopolitan, experienced, knowing, smart, sophisticated, worldly, worldly-wiseAntonyms adult, grown-up, mature