Definition of insurmountable adjective from the Oxford Advanced Learner's Dictionary

 

insurmountable

 adjective
adjective
BrE BrE//ˌɪnsəˈmaʊntəbl//
 
; NAmE NAmE//ˌɪnsərˈmaʊntəbl//
 
(formal)
 
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(of difficulties, problems, etc.) that cannot be dealt with successfully synonym insuperable The age barrier appeared insurmountable. They were now faced with seemingly insurmountable technical problems.
See the Oxford Advanced American Dictionary entry: insurmountable