1. Second, Social Security costs could prove unsupportable for the federal budget as a whole.

2. But forced austerity has triggered big drops in national outputs, so the debt burdens become even more unsupportable.

3. Continued investment-driven growth, he argued, would only result in excess supply and put an unsupportable burden on China's resource base and natural environment.

4. Global best practice is not to close nature reserves. This is unique and scientifically unsupportable position developed in Hong Kong.

5. A court is not bound to credit bald assertions, unsupportable conclusions, and opprobrious epithets woven into the fabric of the complaint.