NSW Opportunity Class
Obdurate
adjective/ob-duh-rate/
stubbornly refusing to change one's opinion or course of action.
In contextDespite the plea, he remained obdurate.
Remember it
Hear 'durable' inside obdurate — hard as stone, refusing to soften or budge.
Use it well
Stronger and more formal than 'stubborn'; often 'remained obdurate' despite pleas or evidence.