impregnable

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• February 20. 2013 from wordnet.princeton.edu

  impregnable — adjective — english

  immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"

• March 24. 2016 from wordnet.princeton.edu

  impregnable — adjective — english

  capable of conceiving

• March 24. 2016 from wordnet.princeton.edu

  impregnable — adjective — english

  incapable of being overcome, challenged or refuted; "an impregnable argument"; "impregnable self-confidence"