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Adjective: hardheaded  'haa(r)d'he-did
  1. Unreasonably rigid in the face of argument, entreaty or attack
    "I wish you knew how hardheaded, reluctant, my love for you is";
    - mulish
  2. Guided by practical experience and observation rather than theory
    "a hardheaded appraisal of our position";
    - hard-nosed, practical, pragmatic

See also: obstinate, realistic, stubborn, unregenerate