puerile

adjective

displaying or suggesting a lack of maturity
成熟の不足を見せる、または示すさま
- adolescent insecurity
  思春期の不安定さ
- jejune responses to our problems
  我々の問題への幼稚な反応
- their behavior was juvenile
  彼らの言動は子供じみていた
- puerile jokes
  幼稚な冗談
of or characteristic of a child
子供の、あるいは子供に特徴的であるさま
- puerile breathing
  小児呼吸

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