determined not to change your ideas, behaviour, opinions etc, even when other people think you are being unreasonable
He was the most obstinate man I’ve ever met.
Despite the evidence, he remained obstinate in his refusal to admit wrongdoing.
The toddler's obstinate behavior made it challenging for the parents to enforce rules.
The negotiators faced an obstinate stance from both parties during the talks.
Some people are naturally obstinate, resisting change even when it is beneficial.
