Obdurate (adj)
ob-doo-rait
Stubbornly refusing to change one’s opinion or course of action.
Late Middle English (originally in the sense ‘hardened in sin, impenitent’): from Latin obduratus, past participle of obdurare, from ob- ‘in opposition’ + durare ‘harden’ (from durus ‘hard’).
Example sentences
“I tried to argue the point but he was so obdurate he wouldn’t budge an inch.”

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