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Definitions of impregnable
  1. adjective
    immune to attack; incapable of being tampered with
    "an impregnable fortress"
  2. adjective
    incapable of being overcome, challenged or refuted
    "an impregnable argument" "impregnable self-confidence"
  3. adjective
    capable of conceiving

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Definition that contains impregnable
  • invulnerable immune to attack; impregnable
  • maginot line a fortification built before World War II to protect France's eastern border; initially considered to be impregnable, it was easily overrun by the German army in 1940
  • impregnably in an impregnable manner
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