IPA: /ɪnˈsuːpərəbəl/
KK: /ɪnˈsuːpərəbəl/
Something that cannot be overcome or dealt with successfully.
The team faced insuperable challenges during the project.
Insuperable → It is formed from "in-" (meaning not) and "superare" (meaning to overcome or surpass). The word "insuperable" means not able to be overcome or surpassed, indicating something that cannot be conquered or dealt with.
Think of something that cannot be 'overcome' ('superare') — the 'in-' means not, so insuperable describes challenges that are impossible to surpass.