English dictionary

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English adjective: immature

1. immature characteristic of a lack of maturity

SamplesImmature behavior.

Similaradolescent, babyish, childish, infantile, jejune, juvenile, puerile


2. immature (used of living things especially persons) in an early period of life or development or growth

SamplesYoung people.


Similaradolescent, boyish, boylike, childlike, childly, early, five-year-old, four-year-old, girlish, infantile, junior, little, newborn, one-year-old, preadolescent, preteen, puppyish, puppylike, schoolboyish, schoolgirlish, small, teen, teenage, teenaged, tender, three-year-old, two-year-old, vernal, young, youngish, youthful

See alsoimmature, junior, new


Domain categoryanimate thing, living thing


3. immature not fully developed or mature; not ripe

SamplesUnripe fruit.
Fried green tomatoes.
Green wood.

Synonymsgreen, unripe, unripened


Antonymsripe, mature

4. immature not yet mature

Similaradolescent, embryologic, embryonal, embryonic, inchoative, larval, prepubertal, prepubescent, prepupal, pubescent, pupal, underdeveloped

See alsoimmature, premature, young

Attributeage, matureness, maturity


5. immature (of birds) not yet having developed feathers

SamplesA small unfledged sparrow on the window sill.



Antonymsfledged, mature

Based on WordNet 3.0 copyright © Princeton University.
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