immature

/ɪməˈtjʊə(ɹ)/

noun

  1. 1

    An immature member of a species.

adjective

  1. 1

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

  2. 2

    Not fully formed or developed; not grown.

  3. 3

    Childish in behavior; juvenile.

    The man was immature for throwing a tantrum.

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