boyish manners
definitions
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Behavior, attitudes, or social conduct that are characteristic of a boy rather than a girl, often implying a lack of traditional feminine etiquette, a sense of playfulness, or a spirited, informal nature.ja: 男の子のような振る舞い
examples
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She was admired for her boyish manners and energetic spirit.
彼女は男の子のような振る舞いとエネルギッシュな精神で称賛された。