Obdurate

Obdurate means very stubborn—someone who refuses to change their opinion, even when they’re clearly wrong or others try to persuade them.

Simple meaning:

Obdurate = stubborn + hard-hearted

Examples:

“He was obdurate and refused to apologize.” “No matter the advice, she remained obdurate.”

Similar words: Stubborn Unyielding Hard-headed Opposite: Flexible Open-minded