1) Acute 2) Discriminating 3) Incisive 4) Keen 5) Knifelike 6) Penetrating 7) Perceptive 8) Piercing 9) Sharp 10) Tending to penetrate 1) Incisive 2) Keen 3) Penetrating 4) Piercing 
• (a.) Acute; discerning; sagacious; as, penetrative wisdom. • (a.) Tending to penetrate; of a penetrating quality; piercing; as, the penetrative sun. • (a.) Having the power to affect or impress the mind or heart; impressive; as, penetrative shame.
1. Tending to penetrate; of a penetrating quality; piercing; as, the penetrative sun. 'His look became keen and penetrative.' (Hawthorne) ... 2. Having the power to affect or impress the mind or heart; impressive; as, penetrative shame. ... 3. Acute; discerning; sagacious; as, penetrative wisdom. 'The penetrative eye.' 'Led on by skill of penetrati...
Pen'e·tra·tive adjective [ Confer French pénétratif .] 1. Tending to penetrate; of a penetrating quality; piercing; as, the penetrative sun. « His look became keen and penetrative .» Hawthorne. 2. Having the power to affect or impress the ...
[adj] - tending to penetrate
penetrating adjective 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`