Obstinate (adjective)

1. Stubbornly refusing to change one's mind or course of action.
2. Persistently or stubbornly refusing to do something.

Origin:

The word "obstinate" comes from the latin word "obstinatus" which means "stubborn".

Examples:

1. He was obstinate and refused to change his mind.
2. The child was obstinate and refused to eat his vegetables.
3. She was obstinate in her refusal to comply with the request.
4. The obstinate dog refused to come when called.
5. He was obstinate in his determination to finish the project.