puerile

Adjective
  1. Of or characteristic of a child (synset 303115918)
    "puerile breathing"
  2. Displaying or suggesting a lack of maturity (synset 301495744)
    "adolescent insecurity"; "jejune responses to our problems"; "their behavior was juvenile"; "puerile jokes"
    similar to: immature - characteristic of a lack of maturity
    same as: adolescent, jejune, juvenile

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