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Adjective: pigheaded  pig'he-did
  1. Obstinate and stupid
    "It just made her all the more stubborn and pigheaded";
    - bullheaded, bullet-headed
Adverb: pig-headedly
  1. In a stubborn unregenerate manner
    "she remained pig-headedly in the same position";
    - stubbornly, obdurately, mulishly, obstinately, cussedly, bloody-mindedly [Brit], intransigently

See also: obstinate, stubborn, unregenerate