勤敏 is a compound adjective formed by combining 勤 (qín), meaning 'diligent,' 'industrious,' or 'hardworking,' and 敏 (mǐn), meaning 'quick-witted,' 'sharp,' or 'keen.' Together, they describe someone who is both consistently hardworking and mentally agile — not just busy, but purposefully attentive and quick to understand or respond. It emphasizes a balanced excellence: sustained effort paired with mental clarity and responsiveness.

This term is commonly used in formal or complimentary contexts — for example, when praising students, professionals, or apprentices for their admirable work ethic and intelligence. It often appears in written Chinese, such as recommendation letters, performance reviews, or biographical sketches, and carries a respectful, slightly literary tone. While not colloquial in everyday speech, it’s widely understood and valued in educational and professional settings as a mark of holistic competence.