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



BrE BrE//ɪnˈsuːpərəbl//
, also BrE//ɪnˈsjuːpərəbl//
; NAmE NAmE//ɪnˈsuːpərəbl//
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(of difficulties, problems, etc.) that cannot be dealt with successfully synonym insurmountable Word Origin Middle English (in the general sense ‘invincible’): from Old French, or from Latin insuperabilis, from in- ‘not’ + superabilis (from superare ‘overcome’).
See the Oxford Advanced American Dictionary entry: insuperable