immature.
Occurring before the proper time; untimely, premature (especially of death).
Meaning & usage
Occurring before the proper time; untimely, premature (especially of death).
Not fully formed or developed; not grown.
Childish in behavior; juvenile.
You're only young once, but you can be immature the rest of your life.
The man was immature for throwing a tantrum.
Where this word comes from
From Middle French immature. Partially displaced unripe, from Old English unrīpe (“unripe, immature”).
An immature member of a species.
Where this word comes from
From Middle French immature. Partially displaced unripe, from Old English unrīpe (“unripe, immature”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.