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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
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. 2014.
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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
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