childish Definition

infantile, immature, puerile, silly, ridiculous, jejune, naive, kiddo, boyish, simple, juvenile, childhood, kindergarten, child, infant, pediatric, fledgling, naïve, unadult, petulant, stupid, sophomoric, idiotic, childlike, thoughtless, moronic, nonsensical, foolish, selfish, pathetic, absurd, disrespectful, babyish, illogical, asinine, arrogant, cynical, mischievous, flippant, spiteful, mindless, vulgar, foolishness, obnoxious, goofy, irresponsible, ludicrous, brainless, laughable, hypocritical, dumb, comical, rude, hateful, frivolous, pointless, crass, egotistical, trite, ungentlemanly, unserious, indecorous, insolent, puerileness, egocentric, disgusting, uncouth, tactless, egoistical, narcissistic, contemptible, unthoughtful, uncivil, irrational, sarcastic, shameless, vacuous, meanspirited, misguided, unprofessional, despicable, condescending, uncivilized, unchivalrous, simpleminded, simplistic, overcritical, boorish, unforgivable, uncreative, outrageous, cowardly, unbecoming, schoolmarmish, unintelligent, whiny, insincere, daft, peevish, imbecilic,