"conscientious" in the adjective sense
1. conscientious, painstaking, scrupulous
characterized by extreme care and great effort
"conscientious application to the work at hand"
"painstaking research"
"scrupulous attention to details"
2. conscientious
guided by or in accordance with conscience or sense of right and wrong
"a conscientious decision to speak out about injustice"
Source: WordNet® (An amazing lexical database of English)
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