adjective
- Immune to attack; incapable of being tampered with.
- usage: "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
- synonyms: inviolable, secure, strong, unassailable, unattackable
- Capable of conceiving.
- synonyms: conceptive
- Incapable of being overcome, challenged or refuted.
- usage: "an impregnable argument"; "impregnable self-confidence"
- synonyms: inexpugnable
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). impregnable. Retrieved September 20, 2026, from http://smartdefine.org/impregnable/definitions/1176227 |
| Chicago | WordNet. 2010. "impregnable" http://smartdefine.org/impregnable/definitions/1176227 (accessed September 20, 2026). |
| Harvard | WordNet 2010, impregnable, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/impregnable/definitions/1176227>. |
| MLA | WordNet. "impregnable" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/impregnable/definitions/1176227> |