Meaning : Characterized by extreme care and great effort.
Example :
Conscientious application to the work at hand.
Painstaking research.
Scrupulous attention to details.
Synonyms : painstaking, scrupulous
Meaning : Guided by or in accordance with conscience or sense of right and wrong.
Example :
A conscientious decision to speak out about injustice.
Not conscientious.
unconscientious