頑固的英文：
stubborn; intransigent; mulish; obstinate; pigheaded

stubborn是什么意思：
adj. 固执的，执拗的；难以去除的

There is no reasoning with such a stubborn man as Peter.
跟彼得这种固执的人讲理简直是不可能的事。

This stain is really stubborn.
这污垢去不掉。

Ingrain stubbornness of character.
天生固执的性格。

intransigent是什么意思：
a. 非妥协性的
n. 不妥协的人
a. 顽固的;

Owing to their intransigent attitude we were unable to reach an agreement
由於他们态度僵硬,我们无法达成协议

The reason for this lamentable state of affairs is political intransigence or lack of focus.
会出现这种令人遗憾的局面，原因是政治上拒绝让步或缺乏关注。

But neither should you permit Hanoi's intransigence to blot out the prospects we together have so patiently prepared
但你们也不应允许河内顽固地抹煞我们一起为此耐心培育出来的前景。

mulish是什么意思：
a. 骡的,执拗的,杂种的；骡子似的