a.

1. 顽固的，固执的
   She was as obstinate as a mule.

   她十分固执。

2. 顽强的，不屈服的
3. （疾病等）难治的；难以控制的
   These weeds are really very obstinate.

   这些草实在难以除尽。

adj.

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