not permitting penetration or passage; impenetrable: The coat is impervious to rain.
incapable of being injured or impaired: impervious to wear and tear.
incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another's suffering.
Also, imperviable [im-pur-vee-uh-buhl] .

1640–50; < Latin impervius. See im-2, pervious

imperviously, adverb
imperviousness, noun

impermeable, impervious.

3. invulnerable, closed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
impervious or imperviable (ɪmˈpɜːvɪəs)
adj (foll by to)
1.  not able to be penetrated, as by water, light, etc; impermeable
2.  not able to be influenced (by) or not receptive (to): impervious to argument
imperviable or imperviable
im'perviously or imperviable
im'perviousness or imperviable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1650, from L. impervius "that cannot be passed through," from in- "not" + pervius "letting things through," from per "through" + via "road."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They contained everything that was needed to support life underground and were
  virtually impervious to enemy infiltration.
Peptides still appeared utterly impervious to all the new mechanisms of
  resistance that bacteria had employed.
We have already established that certain people here are impervious to logic.
These structures are often stable and impervious to meteor impacts.
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