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immature

adjectivenounattested in dialogue

  • //ɪməˈtjʊə(ɹ)//
  • //ɪməˈt͡ʃʊə(ɹ)//
  • //ɪməˈt͡ʃə(ɹ)//

Not fully formed or developed; not grown.

adjective

  1. 1

    archaicOccurring before the proper time; untimely, premature (especially of death).

    And thou also canst best account for the causes of her immature death […].

  2. 2

    Not fully formed or developed; not grown.

  3. 3

    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.

    Wilhelm Stekel - As quoted in The Catcher in the Rye (1951) by J. D. Salinger. The mark of the immature man is that he wants to die nobly for a cause, while the mark of a mature man is that he wants to live humbly for one.

Etymology

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

noun

  1. 1

    An immature member of a species.

    There are many genera and even families of Brachypylina for which immatures are not yet known, and thus numerous examples of adult convergence and misclassification remain to be revealed: such is the case with Hypozetes.

    While on a walk the next morning I found what looked like a patch of old growth habitat - perhaps somewhere the fires had missed - and to my astonishment saw a female Red-lored Whistler accompanied by an immature.

Forms

plural
immatures
comparative
more immature
superlative
most immature
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).