A problem that is insuperable cannot be dealt with successfully.
例句
...an insuperable obstacle to negotiations.談判過程中難以克服的障礙
英漢詞典釋義
adj.
不能逾越的;不能克服的
insuperable difficulties不能克服的困難triumph against seemingly insuperable odds在看似無法扭轉的逆境中取得的勝利The difficulties that confront us seem insuperable.我們面臨的困難似乎是不可克服的。