insurmountable

US /ˌɪn.sɚˈmaʊn.t̬ə.bəl/
UK /ˌɪn.sɚˈmaʊn.t̬ə.bəl/
1.

không thể vượt qua

(especially of a problem or a difficulty) so great that it cannot be dealt with successfully:

:
insurmountable difficulties