adj.

1. Not fully grown or developed. See synonyms at young.
2. Marked by or suggesting a lack of normal maturity: silly, immature behavior.

[Latin immātūrus : in-, not; see in–¹ + mātūrus, mature.]

immaturely im'ma·ture'ly adv.
immaturity im'ma·tur'i·ty or im'ma·ture'ness n.

adjective

1. Being in an early period of growth or development: green, infant, juvenile, young, youthful. See youth/age/maturity.
2. Of or characteristic of a child, especially in immaturity: babyish, childish, infantile, juvenile, puerile. See youth/age/maturity.

adj

Definition: young, inexperienced
Antonyms: adult, developed, experienced, grown, mature, old, ripe

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Unripe or not fully developed.

IN BRIEF: Not full-grown or developed.

Immature love says: I love you because I need you. Mature love says: I need you because I love you. — Erich Fromm (1900-1980), U.S. psychologist. The Art of Loving, ch. 2 (1956).

Dansk (Danish)
adj. - umoden

Nederlands (Dutch)
onvolwassen

Français (French)
adj. - vert (un fruit), immature (un enfant) (péj)

Deutsch (German)
adj. - unreif

Ελληνική (Greek)
adj. - ανώριμος, άγουρος

Italiano (Italian)
immaturo

Português (Portuguese)
adj. - imaturo

Русский (Russian)
незрелый

Español (Spanish)
adj. - inmaduro

Svenska (Swedish)
adj. - omogen (äv. bildl.), outvecklad, förtidig

中文（简体） (Chinese (Simplified))
不成熟的, 未完全发展的

中文（繁體） (Chinese (Traditional))
adj. - 不成熟的, 未完全發展的

한국어 (Korean)
adj. - 미숙한, 미성년의, (지형이) 유년기의

日本語 (Japanese)
adj. - 未成熟の, 未完成の, 侵食が初期の
n. - 未成熟な者

العربيه (Arabic)
‏(صفه) غير ناضج‏

עברית (Hebrew)
adj. - ‮לא בשל, לא מפותח‬

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