Source : Webster's Revised Unabridged Dictionary (1913)

Obduracy \Ob"du*ra*cy\, 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.

Source : WordNet®

obduracy
     n : resoluteness by virtue of being unyielding and inflexible
         [syn: {adamance}, {unyieldingness}]