An obstinate person is someone who is stubborn and unwilling to change their opinion or course of action. This type of person can be likened to a MULE, an ASS, and a DIEHARD. A MULE is an animal known for its stubbornness and refusal to move, while an ASS is another animal that is similarly stubborn and unyielding. A DIEHARD is a person who is extremely loyal and devoted to a cause, and will not give up despite any obstacles.