con·sci·en·tious 
(kŏn′shē-ĕnshəs)
(kŏn′shē-ĕnshəs)adj.
1. Guided by or in accordance with the dictates of conscience; principled: a conscientious decision to speak out about injustice.
2. Thorough and assiduous: a conscientious worker; a conscientious effort to comply with the regulations. See Synonyms at diligent.
[Obsolete French conscientieux, from Medieval Latin cōnscientiōsus, from Latin cōnscientia, conscience; see CONSCIENCE.]
con′sci·entious·ly adv.
con′sci·entious·ness n.