Synonyms of immature in English:

immature


See definition of immature

adjective

1‘white Stilton is a very young, immature Stilton’

SYNONYMS
unripe, not ripe, not mature, not matured, unmellowed
undeveloped, unformed, imperfect, unfinished, incomplete
crude, raw, green
ANTONYMS

ripe, mature

2‘she is an extremely shy and immature girl’

SYNONYMS
childish, babyish, infantile, juvenile, puerile, jejune, callow, green, inexperienced, unsophisticated, unworldly, naive, ingenuous
informal wet behind the ears, born yesterday
ANTONYMS

mature