Capable of being impregnated; impregnatable.
Of a fortress or other fortified place: able to withstand all attacks; impenetrable, inconquerable, unvanquishable.
Too strong to be defeated or overcome; invincible.
More or most likely to be exposed to the chance of being attacked or harmed, either physically or emotionally.
Open to disclosing one's inner thoughts and feelings, acting in spite of one's instinct to self-preservation.
More likely to be exposed to malicious programs or viruses.