— imperviously , adv. — imperviousness , n.
/im perr"vee euhs/ , adj.
1. not permitting penetration or passage; impenetrable: The coat is impervious to rain.
2. incapable of being injured or impaired: impervious to wear and tear.
3. incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another's suffering.
Also, imperviable /im perr"vee euh beuhl/ .
[ 1640-50; impervius. See IM- 2 , PERVIOUS ]
Syn. 3. invulnerable, closed.