That can or does physically penetrate something; piercing, penetrating.
That can penetrate opposition defences.
Pertaining to sexual activity involving penetration by the penis.
Displaying insight or discrimination; acute; penetrating.
Sharp, snithy, piercing.
Showing clever resourcefulness in practical matters.
Streetwise, street-smart.
Knowledgeable, intelligent, keen.
Nigh accurate.
Artful, tricky or cunning.
Severe, intense, hard.