1. 机敏的;尖锐的;深刻的
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.

1. suitable for cutting or piercing

e.g. incisive teeth

2. having or demonstrating ability to recognize or draw fine distinctions

e.g. 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

Synonym: acutediscriminatingkeenknifelikepenetratingpenetrativepiercingsharp