敏感【びんかん】
sensitive, alert, aware, susceptible
機敏【きびん】
smart, clever, shrewd, astute, canny, quick-witted, alert, quick, prompt
鋭敏【えいびん】
sharp, keen, acute
敏速【びんそく】
quickness, agility, activity
敏腕【びんわん】
ability, capability, competence, skill
過敏【かびん】
nervousness, oversensitivity