The meaning of IMMATURE is exhibiting less than an expected degree of maturity. How to use immature in a sentence.

IMMATURE definition: 1. not behaving in a way that is as calm and wise as people expect from someone of your age: 2…. Learn more.

IMMATURE definition: not mature, ripe, developed, perfected, etc. See examples of immature used in a sentence.

If you describe someone as immature, you are being critical of them because they do not behave in a sensible or responsible way.

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

Definition of immature adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Use the adjective immature to describe something that is not fully grown: “Elizabeth rescued an immature sparrow that had fallen from its nest during the storm.”

Jan 27, 2026 · Adjective immature (comparative more immature, superlative most immature) (now rare) Occurring before the proper time; untimely, premature (especially of death). [from 16th c.]

Immature definition: Not mature or ripe; not completely grown or developed.

immature, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary