able to pierce or penetrate / demonstrating acute or keen understanding

present participle of penetrate

The act of penetrating something. / Specifically, the insertion of the penis (or similar object) during sexual intercourse.

To enter into; to make way into the interior of; to pierce. / (figuratively) To achieve understanding of, despite some obstacle; to comprehend; to understand.

simple past tense and past participle of penetrate

Capable of being penetrated, entered, or pierced. Also figuratively.

plural of penetration

Third-person singular simple present indicative form of penetrate

The extent to which something is penetrable

That can or does physically penetrate something; piercing, penetrating. / Displaying insight or discrimination; acute; penetrating. / (sports) That can penetrate opposition defences.