IMMATURE

adj. 1 premature, undeveloped, unripe, rudimentary, half-grown, unformed, unfledged, fledgling, unfinished, young, new, fresh, incomplete The immature growth in the spring is not hardy enough to survive a frost 2 green, callow, unsophisticated, naïve, jejune, inexperienced, babyish, childish, childlike, puerile, juvenile, raw, Colloq wet behind the ears She is a bit immature to assume so many responsibilities