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