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.fr: Manières de garçon
examples
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She was admired for her boyish manners and energetic spirit.
Elle était admirée pour ses manières de garçon et son esprit énergique.