bullheaded

bull +‎ headed

bullheaded (comparative more bullheaded, superlative most bullheaded)

1. Unreasonably stubborn.

   John was so bullheaded that he kept driving and refused to stop for directions, even after getting hopelessly lost.

   • 1964 [1929], William Faulkner, Sartoris (The Collected Works of William Faulkner), London: Chatto & Windus, page 23:

     “I know, my dear. I’ve lived with these bullheaded Sartorises for eighty years, and I’ll never give a single ghost of ’em the satisfaction of shedding a tear over him. What did Horace’s message say?”