a. tenaciously unwilling or marked by tenacious unwillingness to yield
a. 顽固的, 不听话的, 执拗的, 棘手的
1. She is very stubborn and never changes her mind.
她非常固执，永远不改变主意。
2. It's hard to convince him because he is so stubborn.
说服他很难，因为他太固执了。
3. My dog can be stubborn when it comes to training.
我的狗在训练时可能会很固执。