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Adjective: puerile   pyûr-ul or 'pyûr,I(-u)l [N. Amer], 'pyûr,rI(-u)l [Brit]
  1. Of or characteristic of a child
    "puerile breathing"
     
  2. Displaying or suggesting a lack of maturity
    "puerile jokes";
    - adolescent, jejune, juvenile

See also: immature

Encyclopedia: Puerile