We all admire his obdurate [ˈɑbdɚɹət] refusal to give up on his goal despite the many challenges he faced.

obdurate
adj [ˈɑbdɚɹət]

Obdurate is a formal word that means “resistant to persuasion.” It is usually used to describe someone who is stubborn or not willing to change their opinion or the way they do something.

the words obdurate, dour, endure, and durable are etymological kissing cousins. All trace back to the Latin adjective durus, which means “hard.”

English