Pronunciation: (im-pûr'vē-us), [key]
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,im•per•vi•a•blePronunciation: (im-pûr'vē-u-bul). [key]
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.