• 敏ビン感かん — sensitive / responsive / quick to notice
• 機敏きびん — agile / quick-moving / nimble
• 過敏かびん — overly sensitive / hypersensitive
• 鈍感どんかん vs. 敏感びんかん — dull / insensitive vs. sharp / sensitive
• 敏速びんそく — quick / prompt / rapid response

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敏 describes speed of mind and body. Someone who is 敏い (としい / さとい in older forms) reacts quickly, notices details fast, and moves without delay.

In modern Japanese you mostly see 敏 in compounds like 敏感 or 機敏. Think “fast to feel it” or “fast to act.”