Impenetrably adv. : In an impenetrable manner or state; imperviously.

Example:


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Defination from the web:
impenetrable from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: Middle English impenetrabel, from Middle French impenetrable, from Latin impenetrabilis, from in- + penetrabilis penetrable ...