n.无能；无力

I can't understand his inability in figuring out the math problems. 我无法理解他这种在数学上的无能。

Nativists fret about America's inability to secure its own borders. 本土主义者抱怨美国对自己边境管理的无能。

With his diminishing ranks and inability to hold the Scourge throng, he capitulated to the offer to join the Sentinel. 随著他对天遣大军的战争中逐渐消耗的士兵以及无力感，他有条件的接受了了铁卫军的邀请。