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impenetrable

[im-pen-i-truh-buh l] /ɪmˈpɛn ɪ trə bəl/
adjective
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.
Origin of impenetrable
late Middle English
1425-1475
1425-75; late Middle English impenetrabel < Latin impenetrābilis. See im-2, penetrable
Related forms
impenetrableness, noun
impenetrably, adverb
Synonyms
3. incomprehensible, mysterious, obscure, hidden.
Antonyms
3. clear, lucid.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for impenetrably
Contemporary Examples
  • “In this country that we were told was impenetrably dangerous, guys were just turning up,” he said.

    Iraq, Under the Boot Jace Lacob October 14, 2009
Historical Examples
  • The little brown girl, with eyes that saw so much and were so impenetrably deep, and the mobile face, so alert and responsive.

    That Fortune Charles Dudley Warner
  • The rushlight had burned out and the cell was impenetrably dark.

    Micah Clarke Arthur Conan Doyle
  • Then there was nothing but the wall itself, dark, thin as a membrane, but impenetrably strong.

    Last Resort Stephen Bartholomew
  • "Till nine o'clock or a little after," suggested Mrs. Travers, impenetrably.

    The Rescue Joseph Conrad
  • The lower front of it seemed to be arched and pillared—and under each arch the shadows were impenetrably black.

    The Seven-Branched Candlestick Gilbert W. (Gilbert Wolf) Gabriel
  • It was a cold, rainy, and impenetrably dark night on the tow-path.

    A Tale of the Tow-Path Homer Greene
  • How had they the craft to find them, so securely, so impenetrably were they hidden!

    The Story of Old Fort Loudon Charles Egbert Craddock
  • The choir is impenetrably dark most of the year at this early hour.

  • Mr. Vanborough looked back into the far corner of the room, in which the lawyer sat, impenetrably waiting for events.

    Man and Wife Wilkie Collins
British Dictionary definitions for impenetrably

impenetrable

/ɪmˈpɛnɪtrəbəl/
adjective
1.
incapable of being pierced through or penetrated: an impenetrable forest
2.
incapable of being understood; incomprehensible: impenetrable jargon
3.
incapable of being seen through: impenetrable gloom
4.
not susceptible to ideas, influence, etc: impenetrable ignorance
5.
(physics) (of a body) incapable of occupying the same space as another body
Derived Forms
impenetrability, noun
impenetrableness, noun
impenetrably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for impenetrably

impenetrable

adj.

mid-15c., from Middle French impenetrable, from Latin impenetrabilis "that cannot be penetrated," from assimilated form of in- "not, opposite of" (see in- (1)) + penetrabilis "penetrable" (see penetrate). Related: Impenetrably; impenetrability.

Online Etymology Dictionary, © 2010 Douglas Harper
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