impenetrably

== English == === Etymology === From impenetrable +‎ -ly. === Adverb === impenetrably (comparative more impenetrably, superlative most impenetrably) In an impenetrable manner or state; imperviously. === References === William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “impenetrably”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC. “impenetrably”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.