impenetrable Hear it!

impenetrable definition

im·pen·etrable (im pen′i trə bəl)

adjective

  1. that cannot be penetrated or passed through an impenetrable jungle
  2. that cannot be solved or understood; unfathomable; inscrutable
  3. unreceptive to ideas, impressions, influences, etc.
  4. Physics having that property of matter by which two bodies are prevented from occupying the same space at the same time

Etymology: ME inpenetrable < Fr impénétrable < L impenetrabilis

Related Forms:

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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