puerile

adjective
🔊/ˈpjʊəraɪl/
🔊/ˈpjʊrəl/
(disapproving)
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  1. silly; suitable for a child rather than an adult愚蠢的;幼稚的;孩子气的 synonym childish
    Word Originlate 16th cent. (in the sense ‘like a boy’): from French puéril or Latin puerilis, from puer ‘boy’.