Etymology

immature

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Today it means: Occurring before the proper time; untimely, premature (especially of death). Full definition →

First used 16th c.Middle French immature
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The story

  1. Middle French · borrowed fromimmature
  2. English todayimmature

From Middle French immature. Partially displaced unripe, from Old English unrīpe (“unripe, immature”).

First known use, by meaning

  • from 16th c. Occurring before the proper time; untimely, premature (especially of death).
  • from 17th c. Not fully formed or developed; not grown.
  • from 20th c. Childish in behavior; juvenile.

Etymology from Wiktionary, CC BY-SA 4.0.