|Origin:||, past participle of obstinare 'to be determined'|
determined not to change your ideas, behaviour, opinions etc, even when other people think you are being unreasonable [= stubborn]:
He was the most obstinate man I've ever met.
Don't be so obstinate!
an obstinate refusal to obey
2 [only before noun] British English
difficult to deal with or get rid of:
a complex and obstinate issue
—obstinacy noun [uncountable]