Meaning

verb persist stubbornly

adjective tenaciously unwilling or marked by tenacious unwillingness to yield

adjective stubbornly persistent in wrongdoing

originInherited from Middle English obstinat(e) (“obstinate, stubborn”), from Latin obstinātus, perfect passive participle of obstinō (“set one's mind firmly upon, resolve”) (see -ate (adjective-forming suffix)), from ob (“before”) + *stinare, from stare (“to stand”). Doublet of ostinato.

Etymology from Wiktionary, CC BY-SA 3.0