Adjective
1. 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"2. very penetrating and clear and sharp in operation;
"an incisive mind""a keen intelligence""of sharp and active intellect"3. suitable for cutting or piercing;
"incisive teeth""the piercing needle"