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Adjective: conscientious  ,kón-shee'en-shus
  1. Guided by or in accordance with conscience or sense of right and wrong
    "a conscientious decision to speak out about injustice"
  2. Characterized by extreme care and great effort
    "conscientious application to the work at hand";
    - painstaking, scrupulous

See also: careful

Antonym: unconscientious

Encyclopedia: Conscientious