What is the meaning of impregnable?

adjective

  • Immune to attack; incapable of being tampered with.
    • usage: "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
  • Capable of conceiving.
  • Incapable of being overcome, challenged or refuted.
    • usage: "an impregnable argument"; "impregnable self-confidence"
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APAWordNet. (2010). impregnable. Retrieved September 20, 2026, from http://smartdefine.org/impregnable/definitions/1176227
ChicagoWordNet. 2010. "impregnable" http://smartdefine.org/impregnable/definitions/1176227 (accessed September 20, 2026).
HarvardWordNet 2010, impregnable, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/impregnable/definitions/1176227>.
MLAWordNet. "impregnable" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/impregnable/definitions/1176227>
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