insuperable

adjective
🔊/ɪnˈsuːpərəbl/
🔊/ɪnˈsuːpərəbl/
(formal)
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  1. (of difficulties, problems, etc.困难、问题等) that cannot be dealt with successfully 无法克服的;难以解决的;不可逾越的synonym insurmountableTopics Difficulty and failurec2
    Oxford Collocations DictionaryInsuperable is used with these nouns:
    • obstacle
    • problem
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    Word OriginMiddle English (in the general sense ‘invincible’): from Old French, or from Latin insuperabilis, from in- ‘not’ + superabilis (from superare ‘overcome’).