| What is doubtable, or at least unproven, is the capacity of modern humans to choose, make, and maintain such an economy. |
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| The existence of a cover-up is not doubted by anyone in particular, you understand, it's just ontologically a doubtable concept. |
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| Layers of confusion build and opinions that once were entirely convincing become doubtable and strange. |
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| Many customers were then reluctant to spend high amounts on leaves which they could barely see and which may be of doubtable quality. |
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| Greg Cote warns in The Miami Herald that you should not doubt the resolve of James and Wade, but that's what makes them compelling, that they are so doubtable. |
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| It is true that before Descartes, other Montaigne French philosophy, had said any thought is not doubtable and accuracy of every belief is only probable. |
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