im·pen·i·tence /(ˌ)ɪmˈpɛnətən(t)s/
  不知悔改,頑固
  Im·pen·i·tence n.  The condition of being impenitent; failure or refusal to repent; hardness of heart.
     He will advance from one degree of wickedness and impenitence to another.   --Rogers.
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  impenitence
       n : the trait of refusing to repent [syn: impenitency]