intractable

1. ADJ Intractable people are very difficult to control or influence. (人) 难对付的[正式]

What may be done to reduce the influence of intractable opponents?

可以做些什么来削弱难以对付的对手们的影响呢？

2. ADJ Intractable problems or situations are very difficult to deal with. 棘手的[正式]

The economy still faces intractable problems. 经济依然面临一些棘手的问题。