suitable for cutting or piercing; "incisive teeth"; "the piercing needle" very penetrating and clear and sharp in operation; "an incisive mind"; "a keen intelligence"; "of sharp and active intellect
approval You use incisive to describe a person, their thoughts, or their speech when you approve of their ability to think and express their ideas clearly, briefly, and forcefully. a shrewd operator with an incisive mind. showing intelligence and a clear understanding of something incisive remarks/criticism etc
having or demonstrating ability to recognize or draw fine distinctions; "an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent penetrative observations"