obstinate
adjective
°Stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent.
"1686, Montaigne, translated by Charles Cotton, "That men are justly punished for being obstinate in the defence of a fort that is not in reason to be defended","
°Said of inanimate things not easily subdued or removed.
synonyms: bloody-minded, persistent, stubborn, pertinacious more» , unrelenting, inexorable