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• s  impossible to surmount
• s  incapable of being surmounted or excelled
  insuperable odds
  insuperable heroes

• Even if the fuel is something exotic like antimatter, carrying far more energy than sunlight or uranium, the problem of cooling the engine remains insuperable.
• It also turns out to be the insuperable problem A Mighty Heart cannot solve.
• The issues that separate us are not insuperable.

• insurmountable
• unconquerable

News & Articles

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• Disability, Service, and Stewardship
  There’s a dangerous tendency in America today to view disabilities of various kinds as insuperable barriers to productive and loving service.
  Aug. 7, 2013 - Acton Commentary

Quotes

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• Daniel Ellsberg in USA Today
  At the moment, facing a well-funded, powerful incumbent without party support, the odds against Cindy appear insuperable,said Ellsberg, who was arrested twice with other protesters outside Bush's Texas ranch.
• Ralph Nader in FOXNews
  No other country comes close to providing voters with such a small number of choices and making third party candidates hurdle an almost insuperable number of obstacles just to get on the ballot,said Nader, the Green Party's 2000 presidential...
• Boris Johnson in Teamtalk.com
  Of the hunt to find a permanent top-flight football club for the stadium, Johnson said: "In the end there were insuperable obstacles to do that. With the shape of the stadium it would have cost far more to have created a stadium suitable for...