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• s  immune to attack; incapable of being tampered with
  an impregnable fortress
• s  capable of conceiving
• s  incapable of being overcome, challenged or refuted
  an impregnable argument
  impregnable self-confidence

• It recounts the story of the ancient impregnable city that was destroyed partly by its overreaching.
• His commander adopted the scheme, and Scruggs had his first taste of plotting to crack defenses that had been thought to be impregnable.
• Bush's argument is tight, concise and, so far, impregnable.

• inviolable
• secure
• strong
• unassailable
• unattackable
• conceptive
• inexpugnable

News & Articles

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• WILLIAMS
  By Toby Davis LONDON (Reuters) - After all the shocks and spills of the opening week, top seed Serena Williams remained impregnable as she unleashed her full arsenal to move almost effortlessly into the last 16 at Wimbledon on Saturday. A crushing 6-2 6-0 win over Japanese veteran Kimiko Date-Krumm offered a reminder that while her closest rivals in the women's game are often vulnerable to ...
  June 30, 2013 - Reuters via Yahoo! News
• Serena Turns on Style to Beat Golden Oldie
  After all the shocks and spills of the opening week, top seed Serena Williams remained impregnable as she unleashed her full arsenal to move almost effortlessly into the last 16 at Wimbledon on Saturday.
  June 29, 2013 - New York Times
• Tennis-Serena turns on style to beat golden oldie
  (Adds details, quotes, byline) By Toby Davis LONDON, June 29 (Reuters) - After all the shocks and spills of the opening week, top seed Serena Williams remained impregnable as she unleashed her full arsenal to move almost effortlessly into the last 16 at Wimbledon on Saturday. A crushing 6-2 6-0 win over Japanese veteran Kimiko Date-Krumm offered a reminder that while her closest rivals in the ...
  June 29, 2013 - Reuters via Yahoo! Sports

Quotes

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• Boris Johnson in The Voice
  In an article for the London Evening Standard, Boris wrote: "I have found myself brooding - like all paranoid politicians - on the negative voices, the people who say that the great King Newt is too dug in, that his positions are impregnable, his...
• David Gill in Times Online
  The interest in football around the world is increasing - it is not saturated,Gill said. "We have worked on our global position for many years, but it would be wrong to think that we are impregnable. If we did that, we would get knocked...
• Hugo Black in Evening Bulletin
  Writing for the Court in Everson, Justice Hugo Black concluded, "The First Amendment has erected a wall between church and state. That wall must be kept high and impregnable. We could not approve the slightest breach."