mulish

/ˈmjuːlɪʃ/
adjective
  1. Stubborn; refusing to change one's opinion or plans, like a mule.
    • Despite all the evidence, he remained mulish and would not admit he was wrong.
    • Her mulish attitude made it impossible to negotiate a compromise.
    • The child was being mulish about eating his vegetables, no matter how much we coaxed him.
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