Adjective puerile has 2 senses
  1. puerile - of or characteristic of a child; "puerile breathing"
  2. adolescent, jejune, juvenile, puerile - displaying or suggesting a lack of maturity; "adolescent insecurity"; "jejune responses to our problems"; "their behavior was juvenile"; "puerile jokes"
    Antonym: mature (indirect, via immature)
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