​(often disapproving) determined not to change your opinion or attitude synonym obstinate. He was too stubborn to admit that he was wrong. Obstinate · Noun · Stubbornly adverb

[uncountable] ​(often disapproving) determination not to change your opinion or attitude. I was committed to my plan out of sheer stubbornness.

There are seven meanings listed in OED's entry for the adjective stubborn, one of which is labelled obsolete. See 'Meaning & use' for definitions, usage, ...

​(often disapproving) in a way that shows you are determined not to change your opinion or attitude synonym obstinately. She stubbornly refused to pay.

A stubborn person is determined to do what he or she wants and refuses to do anything else. They have huge arguments because they're both so stubborn.

​(often disapproving) refusing to change your opinions, way of behaving, etc. when other people try to persuade you to; showing this synonym stubborn.

adjective · unreasonably obstinate; obstinately unmoving: a stubborn child. · fixed or set in purpose or opinion; resolute: a stubborn opponent of foreign aid.

1. a (1) : unreasonably or perversely unyielding : mulish (2) : justifiably unyielding : resolute b : suggestive or typical of a strong stubborn nature.

STUBBORN definition: never changing your ideas, plans, etc. even when you should. Learn more.