hardheaded

她是个固执己见的人，总是基于事实做出决策。

She is a ___hardheaded person who always makes decisions based on facts.

我父亲是个固执的人，从不让感情左右他的决定。

My father is a ___hardheaded who never lets emotions sway his decisions.

无论我们怎么劝说，她依然固执己见。

No matter how we tried to persuade her, she stayed ___hardheaded about her opinion.