[adj] lacking in development; "immature plans"; "an unformed character"
[adj] (of birds) not yet having developed feathers; "a small unfledged sparrow on the window sill"
[adj] not yet mature
[adj] characteristic of a lack of maturity; "immature behavior"
[adj] not fully developed or mature; not ripe; "unripe fruit"; "fried green tomatoes"; "green wood"
[adj] (used of living things especially persons) in an early period of life or development or growth; "young people"
adolescent, baby(a), babyish, boyish, boylike, callow, childish, childlike, childly, early, embryonal, embryonic, formative, girlish, green, inchoative, inexperienced, infant(a), infantile, jejune, junior, juvenile, larval, little, naive, newborn, preadol