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• s  too obvious to be doubted

• There is no occasion for panic for there is indubitable evidence that mortality rate of swine flu is about the same as any other flu.
• The indubutable charms of the jungle could not be seen from the aeroplane as a thick canopy of trees shrouded the jungle in mystery.
• There is now indubitable evidence that there is water just below the surface of the moon.

• beyond doubt

Quotes

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• Rene Descartes in Forbes
  Descartes asks himself whether there is not "one thing : certain and indubitable" that can survive the rigorous skepticism forcing him to doubt everything he knows via his senses.