Definition of Conscientious

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:
consciences
conscientiously