From Longman Dictionary of Contemporary Englishinsurmountablein‧sur‧mount‧a‧ble /ˌɪnsəˈmaʊntəbəl◂ $ -sər-/ adjective formalTOO/TOO MUCHan insurmountabledifficulty or problem is too large or difficult to deal withThe language difference proved an insurmountable barrier.Examples from the Corpusinsurmountable• Graham overcame seemingly insurmountabletransportation barriers to complete his tour.insurmountable barrier• Yet language difficulties have never been insurmountable barriers.• For a start, sheerdistance put a well-nigh insurmountable barrier be-tween me and my peers.• Then it seemed that classdifferences were an insurmountable barrier, but this too was not the only answer.• When it comes to entrepreneurship there are no insurmountable barriersexcept those we impose on ourselves.• The cost was an insurmountable barrier for many small businesses, and these new business strategiescreated many side effects.• The railroads overcame what, until then, had been insurmountable barriers of time and distance.