impenetrable

[im-pen-i-truh-buhl]
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:
1425–75; late Middle English impenetrabel < Latin impenetrābilis. See im-2, penetrable

impenetrableness, noun
impenetrably, adverb


3. incomprehensible, mysterious, obscure, hidden.


3. clear, lucid.
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World English Dictionary
impenetrable (ɪmˈpɛnɪtrəbəl)
 
adj
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
 
impenetra'bility
 
n
 
im'penetrableness
 
n
 
im'penetrably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
These weeds can develop dense, impenetrable stands that crowd out native plants.
The shoots collapse in mid to late summer, forming a dense, impenetrable mat of
  stems and leaves.
And there will be an element of resentment toward the author for making the
  subject matter of the book intentionally impenetrable.
But for me, in my impenetrable mantle, the safety was complete.
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