obstinate \AHB-stuh-nut\

(adjective)

*1 : perversely adhering to an opinion, purpose, or course in spite of reason, arguments, or persuasion
2 : not easily subdued, remedied, or removed

1 완고한, 고집센, 집요한( stubborn )
2 완강한
~ resistance to ···에 대한 완강한 저항
3 제어[정복]하기 힘든; <병이> 난치의, 고치기 힘든

Example sentence:
I argued with Morton until the wee hours of the morning, but he remained obstinate in his refusal to finance the project.