adjective.
Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
impossible to surmount
adjective.
not capable of being surmounted or overcome
Word Usage
"Dean Knowles, the most senior dean in the country, said the cathedral clergy had been put "under a great deal of strain" as they faced what he described as "insurmountable issues" and that his position had become "untenable"."