puerile
US /ˈpjuː.ɚ.ɪl/
UK /ˈpjʊə.raɪl/
形容詞
幼稚な, 子供っぽい
childishly silly and immature
例:
•
His behavior at the meeting was utterly puerile.
会議での彼の態度は全く幼稚だった。
•
I can't believe you're still making such puerile jokes.
まだそんな幼稚なジョークを言っているなんて信じられない。