Definition of "impenetrableness" []

• The quality of being impenetrable. (noun)

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• "I had a tough time reading through your impenetrableness."
• "The highest joy in this life she is not capable of: but then she saves herself many griefs, by her impenetrableness — yet, for ten times the pain that such a sensibility is attended with, would I not part with the pleasure it brings with it."
• "This impenetrableness, my dear, is to be put among the shades in his character."