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Adjective: pigheaded  pig'he-did
  1. Obstinate and stupid
    "The pigheaded child refused to obey his mother";
    - bullheaded, bullet-headed
Adverb: pig-headedly
Usage: informal
  1. In a stubborn, unregenerate manner
    "she remained pig-headedly in the same position";
    - stubbornly, obdurately, mulishly, obstinately, cussedly [informal], bloody-mindedly [Brit], intransigently

See also: obstinate, stubborn, unregenerate