Obdurate or obdurate describes a stubborn, hard-headed, or inflexible person --
There's no point in trying to persuade him; he can be obdurate when it suits him.
Don't be obdurate; try to see things from his point of view.
Obturate or obturate means to close or stop up, as a hole or tube --
You'll need to learn to obturate this tube of the gun, so that gas doesn't escape and explode when you fire it.
The dentist will obturate the cavity with a temporary filling.
Now that you know that, you can say --
"We'll need him to open his mouth to obturate the canal, but he's obdurate, and won't budge."
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