köken: Borrowed from French obstiné, from Latin obstinātus, past participle of obstinō (“set one's mind firmly upon, resolve”). Compare Italian ostinato, Portuguese and Spanish obstinado, Catalan obstinat. Doublet of ostinato.
Learnedly, from Ancient Greek ἄκαμπτος. Morphologically, from ά- (á-, privative α-) + κάμπτω καμπτ- (kámpto kampt-, “bend, turn around”) + -ος (-os). The figurative sense, semantic loan from French inflexible.