Second, they broke down the wall between teen music and adult music, a wall that had been insuperable until then.
Not necessarily an insuperable or lethal problem, but a problem that must be overcome—and certainly not a plus.
But he prefers women - and most certainly does not love the baron, for the insuperable reason that he loves nobody except himself.
The plan found an insuperable obstacle in the political conditions of the time.
This might be thought an insuperable objection; but it is not really so.
With the information they had, Moses and Joshua may have believed that there were no insuperable difficulties.
And the objections of parents in such cases are not insuperable.
He went along the coast for a whole day and a night, passing around the reef which formed an insuperable barrier.
Its fault—an insuperable one—is that it lacks fidelity to nature.
It was all he needed to complete his plan; and it had seemed an insuperable bar.
mid-14c., "unconquerable," from Latin insuperabilis "that cannot be passed over, unconquerable," from in- "not, opposite of" (see in- (1)) + superabilis "that may be overcome," from superare "to overcome," from superus "one that is above," from super "over" (see super-). Figurative use from 1650s. Related: Insuperably.