obduracy /ˈɒbdjʊrəsɪ/

• 1. 

  N-UNCOUNT If you accuse someone of obduracy, you think their refusal to change their decision or opinion is unreasonable. 执拗; 顽固不化 [正式]

  例：

  He shook his head in bewilderment at the obduracy of this man.

  这男人顽固不化，令他困惑不解、连连摇头。