- conscientious, painstaking, scrupulous - characterized by extreme care and great effort; "conscientious application to the work at hand"; "painstaking research"; "scrupulous attention to details"
Antonym: careless (indirect, via careful)
- conscientious - guided by or in accordance with conscience or sense of right and wrong; "a conscientious decision to speak out about injustice"
Antonyms: unconscientious, conscienceless, unconscionable