obstinate
ob-sti-nate
adjective
Refusing to change one's opinion or course of action despite persuasion or difficulty.
"She was obstinate, refusing to admit her mistake."
Thesaurus
Synonyms: unrepentant, obdurate, cussed, unregenerated, unregenerate, wayward, disobedient, contrary, perverse, mulish, pigheaded, contrarious
Antonyms: docile