- (a.) Not possible; incapable of being done, of existing, etc.; unattainable in the nature of things or by means at command; insuperably difficult under the circumstances; absurd or impracticable; not feasible.
- (n.) An impossibility.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Impossible. Retrieved September 22, 2026, from http://smartdefine.org/impossible/definitions/2019732 |
| Chicago | Webster's. 2011. "Impossible" http://smartdefine.org/impossible/definitions/2019732 (accessed September 22, 2026). |
| Harvard | Webster's 2011, Impossible, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/impossible/definitions/2019732>. |
| MLA | Webster's. "Impossible" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/impossible/definitions/2019732> |