未成年人 wèichéngniánrén minor (i.e. person under 18)
How to remember 未成年人: 未 not yet + 成 to become + 年 year + 人 person = minor (i.e. person under 18).
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How it is used
- A minor, a person under 18 - 保护未成年人 (bǎohù wèichéngniánrén) protect minors, 未成年人犯罪 (wèichéngniánrén fànzuì) juvenile crime.
- A legal/formal term (未 not yet + 成年 come of age + 人 person); appears in law and regulations.
- Contrast 成年人 (chéngniánrén, adult); 未成年 alone works as the adjective.