Longman Dictionary of Contemporary English homepage

impenetrable

adjective
     
im‧pen‧e‧tra‧ble
1 impossible to get through, see through, or get into:
The trees formed a dark and impenetrable barrier.
the impenetrable blackness of the night
2 very difficult or impossible to understand:
impenetrable legal jargon
impenetrably adverb
impenetrability noun [uncountable]

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