›unwilling to change your opinion or action despite argument or persuasion; stubborn: an obstinate two-year-old›An obstinate thing or problem is difficult to deal with, remove, or defeat.obstinacy
/ˈɑb·stə·nə·si/n[U]›the obstinacy of the human spiritobstinately
/ˈɑb·stə·nət·li/adv›The engine obstinately refused to start.