quick; prompt; alert; smart; clever; astute; shrewd; quick-witted
機敏な判断で事故を未然に防いだ。
A quick judgment prevented the accident before it happened.
機敏に動ける人材が現場では求められる。
People who can act swiftly are needed on site.
彼女は機敏な対応で顧客の信頼を得た。
She won the clients' trust with her prompt response.