Displaying insight or discrimination; acute; penetrating.
That can or does physically penetrate something; piercing, penetrating.
That can penetrate opposition defences.
Pertaining to sexual activity involving penetration by the penis.
Showing good judgement or the benefit of experience.
Disrespectful.
Aware, informed.
To advise; induce.
Usually with "up", to inform or learn.
To become wise.
To show the way, guide.
To cause to turn.
To direct the course of, pilot.
To instruct.