Once the firm had achieved a position of strength, would-be competitors faced insuperable hurdles.
Given the disappearance of the budget surplus, this might seem insuperable, but there is a silver lining.
The development of English into the world's lingua franca suggests that spelling is not an insuperable barrier.
Still, while the obstacles to recovery might be even greater than had been expected, they are not insuperable.
It also underscores the insuperable problems that confront any effort to create an effective international regime banning chemical weapons.
This is not an insuperable problem if pension promises are properly accounted for.
In any event, Latin America shows that the transition is not insuperable.
But Sampson concluded, "None of the above obstacles are insuperable, " suggesting instead "the replacement of a limited number of U.S. attorneys, " not the wholesale changes Miers wanted.
And there would have to be some deal on the form of the oath MPs take to the Queen... but that would probably not be an insuperable obstacle.
The looming encounter between modern technology and a timeless spiritual tradition might indeed pose an almost insuperable challenge for the latter if Saint Catherine's were located anywhere else.
Poetry is, admittedly, an insuperable problem for quotation compilers.
One reason is that some design limits are insuperable.
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The unresolved Cyprus dispute seems a near-insuperable roadblock.
To fully comprehend the nature of this threat and its sources, it is important to keep in mind that we have seen terrorists and their sponsors cooperating across seemingly insuperable political, ideological and theological divides.
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In years past Turkey's spotty democracy was often cited to prove a negative: the Turkish case (along with Indonesia's and Malaysia's, also with reservations) showed that Islam did not pose an insuperable barrier to multiparty democracy.
As the critic Nell Minow put it to me, there were any number of reasons for sex not to take place in the '40s, '50s and even '60s, but it's a near-insuperable challenge to delay the deed today.
With its passing, a document that was designed -- and proved -- to be an insuperable obstacle to developing and deploying effective protection against missile attack for the American people and their homeland will cease to have that effect.
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