immature

/ษชmษ™หˆtjสŠษ™(ษน)/
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.

    โ€œThe man was immature for throwing a tantrum.โ€

Source: https://en.wiktionary.org/wiki/immature