A problem that is insuperable cannot be dealt with successfully.
例句
...an insuperable obstacle to negotiations.谈判过程中难以克服的障碍
英汉词典释义
adj.
不能逾越的;不能克服的
insuperable difficulties不能克服的困难triumph against seemingly insuperable odds在看似无法扭转的逆境中取得的胜利The difficulties that confront us seem insuperable.我们面临的困难似乎是不可克服的。