a.

1. 頑固的，固執的
   She was as obstinate as a mule.

   她固執得像頭驢子。

2. 頑強的，不屈服的
3. （疾病等）難治的；難以控制的
   These weeds are really very obstinate.

   這些草實在難以除盡。

adj.

1. stubbornly refusing to change one's opinion or chosen course of action.
2. difficult to overcome or change:
   an obstinate problem.