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未成年 (みせいねん, miseinen) Japanese meaning: minor | Kotomora
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どう
意い
が
必ひつ
要よう
だ
。
He is still a minor, so parental consent is required.
Drinking by minors is prohibited by law.
Usage patterns 〈 人ひと 〉 は 未み 成せい 年ねん だ someone is a minor
未み 成せい 年ねん の 〈 事こと 〉 underage (drinking, smoking, etc.)
Drinking by minors is prohibited by law.
未み 成せい 年ねん に 〈 物もの 〉 を 売う る to sell something to a minor
You must not sell tobacco to minors.
Opposites 成年 is the legal status of having reached adulthood, the direct opposite of 未成年 (being under age).
成人 means an adult in a broader, person-focused sense, while 未成年 is the narrower legal term for someone who has not yet reached that status.
Etymology Sino-Japanese compound: 未 means 'not yet' and 成年 means 'adulthood' or 'legal majority', giving the sense 'not yet adult/major'.