(adv.) In an impenetrable manner or state; imperviously.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). impenetrably. Retrieved September 20, 2026, from http://smartdefine.org/impenetrably/definitions/2019483 |
| Chicago | Webster's. 2011. "impenetrably" http://smartdefine.org/impenetrably/definitions/2019483 (accessed September 20, 2026). |
| Harvard | Webster's 2011, impenetrably, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/impenetrably/definitions/2019483>. |
| MLA | Webster's. "impenetrably" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/impenetrably/definitions/2019483> |