— impenetrableness , n. — impenetrably , adv.
/im pen"i treuh beuhl/ , adj.
1. not penetrable; that cannot be penetrated, pierced, entered, etc.
2. inaccessible to ideas, influences, etc.
3. incapable of being understood; inscrutable; unfathomable: an impenetrable mystery.
4. Physics. possessing impenetrability.
[ 1425-75; late ME impenetrabel impenetrabilis. See IM- 2 , PENETRABLE ]
Syn. 3. incomprehensible, mysterious, obscure, hidden.
Ant. 3. clear, lucid.