1. obstinate : not willing to be reasonable and
change your plans, ideas, or behavior指无理地固执已见或听不进他人忠告、意见等顽固性格。
I now see that my obstinate refusal caused problems for everyone.
2. stubborn: very difficult to change or defeat
stubborn:用于褒义指坚定不移，执意顽强；用于贬义指固执已见，侧重生性固执。
A donkey is a stubborn
animal.驴子是不易对付的动物。
After a stubborn
resistance the enemy was fought off at last.
敌人顽强抵抗,但终于被击退了。
3.rigid
坚硬的; 不易弯曲的; 坚固的; 严格的
not willing to change your ideas, attitudes, opinions, etc.:
eg:Both sides have
remained rigid in their resolve.
His rigid adherence to the rules made him unpopular.
