Webster’s Revised Unabridged Dictionary · 1913
Obduracy
Ob′du·ra·cy (ŏb′dū·rȧ·sy̆; 277), n. The duality or state of being obdurate; invincible hardness of heart; obstinacy. "Obduracy and persistency." Shak.
The absolute completion of sin in final obduracy. South.