Mature

Antonyms of MATURE

unripe, burgeoning, ignorant, stop, flourishing, correct, unsuitable, straitlaced, prim, blossoming, halt, inexperienced, puritanical, unfinished, flowering, priggish, prudish, decrease, paid, wither, genteel, undue, decorous, kiddish, seemly, proper, prepaid, unprepared, shrink, lessen, green, cleared, blooming, decent, shrivel, youthful, immature, unready, retreat, clean, polite, G-rated, young, settled, retrogress.