Incapable of being overcome.
"Much as I'd love to play shortstop for the Yankees, my age is an insuperable barrier to realizing any such dream," grandpa remarked.
Incapable of being better than, overcame, mounted, above.
The highest status an object or person can be.
Nothing is higher or better than Insuperable.
Person: What is insuperable?
GOD: I am.