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Adjective: high-minded  'hI'mIn-did
  1. Characterized by pursuit of high or noble principles and goals, often impractically
    "High-minded reformers";
    - idealistic, noble-minded

See also: elevated, exalted, grand, high-flown, lofty, quixotic, rarefied, rarified, romantic, starry-eyed, sublime, utopian, visionary, wild-eyed