Adjective

• S: (adj) acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp (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"
• S: (adj) penetrative, penetrating (tending to penetrate; having the power of entering or piercing) "a toxic penetrative spray applied to the surface"; "a cold penetrating wind"; "a penetrating odor"