na-adjective, noun
Describes sharpness of intellect, insight, or criticism. A literary, somewhat formal word. Often used in phrases like 犀利な分析 (sharp analysis) or 犀利な批評 (keen criticism).
彼の犀利な分析は問題の核心を突いていた。
His sharp analysis hit the core of the problem.
犀利な批評家として知られている。
He is known as a keen critic.