It was the note which the family had taken to sounding on the mention of the Countess Olenska’s name, since she had surprised and inconvenienced them by remaining obdurate to her husband’s advances; but on May’s lips it gave food for thought, and Archer looked at her with the sense of strangeness that sometimes came over him when she was most in the tone of her environment.
There are no more uses of "obdurate" in the book.
Show samples from other sources
Some of the protestors disbanded when the police arrived, but others remained obdurate.
the child’s misery would move even the most obdurate heart