| The U.S. military was so superior as to be virtually unchallengeable on the field of battle. |
| To some neoclassical economists, the Pareto criterion is the unchallengeable linchpin of welfare economics. |
| Perhaps so, if the present masters of jurisprudence in the law schools and on the courts are in unchallengeable control. |
| However, that it is now a constitutional document of some sort is an unchallengeable assertion within the New Zealand context. |
| The demise of the USSR, they declared, created for the United States the opportunity to establish an unchallengeable global hegemony. |
| The President's rule is effectively unchallengeable, though, even without his party's huge parliamentary majority. |
