Someone who is stubborn or who behaves in a stubborn way is determined to do what they want and is very unwilling to change their mind.
obstinate
He is a stubborn character used to getting his own way.
他是一个固执的人,习惯了自己说了算。
A stubborn stain or problem is difficult to remove or to deal with.
This treatment removes the most stubborn stains.
这种方法去掉了顽固的污渍。