obstinate

US /ˈɑːb.stə.nət/
UK /ˈɑːb.stə.nət/
"obstinate" picture
1.

stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so

:
He was obstinate in his refusal to admit he was wrong.
The child was obstinate and refused to eat his vegetables.