1. Not fully formed or developed, unripe, not mature.
  2. Childish in behavior, not mature.
    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.
Synonyms Translations Translations Noun

immature (plural immatures)

  1. An immature member of a species.
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