Impenetrable
From BiblePortal Wikipedia
Impenetrable [1]
(1): ( a.) Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart.
(2): ( a.) Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield.
(3): ( a.) Having the property of preventing any other substance from occupying the same space at the same time.
