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

See also: careful

Antonym: unconscientious

Encyclopedia: Conscientious