Etymology
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immature (adj.)

1540s, "untimely, premature," from Latin immaturus "untimely, unripe," from assimilated form of in- "not, opposite of" (see in- (1)) + maturus "ripe, timely, early" (see mature (v.)). In 16c., usually in reference to early death; main modern sense of "not fully developed" first recorded 1640s. In reference to mentalities or behaviors not considered age-appropriate, from 1920. Related: Immaturely.

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Definitions of immature

immature (adj.)
characteristic of a lack of maturity;
immature behavior
immature (adj.)
not yet mature;
immature (adj.)
not fully developed or mature; not ripe;
Synonyms: green / unripe / unripened
immature (adj.)
(used of living things especially persons) in an early period of life or development or growth;
Synonyms: young
immature (adj.)
(of birds) not yet having developed feathers;
Synonyms: unfledged
From wordnet.princeton.edu