impenetrable

Part of speech: adverb

IMPENETRABLY.

Part of speech: adjective

Not penetrable; possessing impenetrability.

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Usage examples "impenetrable":

  1. She turned away, weary of questioning the impenetrable future, and went back to the inn. - "Man and Wife", Wilkie Collins.
  2. France in control of Louisiana and Florida would be " a wall of brass forever impenetrable to the combined efforts of England and America." - "Union and Democracy", Allen Johnson.
  3. The impenetrable composure of that reply took Grace completely by surprise. - "The New Magdalen", Wilkie Collins.