a difficulter - A person who won’t budge, even if it means getting hit by a

A person who won’t budge, even if it means getting hit by a truck.

My brother is a difficulter. He won’t move even if the house is on fire.

My mom is a difficulter. She won’t let me eat cake for breakfast.

My dog is a difficulter. He won’t sit even if I give him a cookie.