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im·ma·ture

immature

pronunciation:
I m chur
part of speech: adjective
definition 1: not yet fully developed or mature; juvenile.
synonyms:
callow, childish, green, juvenile, tender, undeveloped, unripe, young
antonyms:
adult, mature, ripe
similar words:
abortive, adolescent, embryonic, incomplete, infantile, puerile, raw, rudimentary, scrub
definition 2: lacking the wisdom, discretion, or intellectual development expected of an adult; childish.
synonyms:
childish, infantile, juvenile, puerile
antonyms:
mature
similar words:
adolescent, callow, green, jejune, naive, unsophisticated, young, youthful
derivations: immaturely (adv.), immaturity (n.)