ob·du·ra·cy /ˈɑbdərəsi, djə; ɑbˈdʊrə, əb, ˈdjʊr-/
  頑固,執拗,冷酷
  Ob·du·ra·cy n. The duality or state of being obdurate; invincible hardness of heart; obstinacy. “Obduracy and persistency.”
     The absolute completion of sin in final obduracy.   --South.
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  obduracy
       n : resoluteness by virtue of being unyielding and inflexible
           [syn: adamance, unyieldingness]