1) Careful 2) Diligent 3) Helpful 4) Painstaking 5) Scrupulous 6) Thorough 1) Careful 2) Fastidious 3) French word used in English 4) Fussy 5) Meticulous 6) Painstaking 7) Rigorous 8) Scrupulous 9) Thorough 
• (a.) Influenced by conscience; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong; -- said of a person. • (a.) Characterized by a regard to conscience; conformed to the dictates of conscience; -- said of actions.
Con`sci·en'tious adjective [ Confer French consciencieux , Late Latin conscientiosus .] 1. Influenced by conscience; governed by a strict regard to the dictates of conscience, or by the known or supposed rules of right and wrong; -- said of a person. « The advice of wise and...
[adj] - guided by or in accordance with conscience or sense of right and wrong 2. [adj] - characterized by extreme care and great effort
conscientious A reference to someone who is obedient or loyal to his/her conscience; habitually governed by a sense of duty; scrupulous.
painstaking adjective characterized by extreme care and great effort; `conscientious application to the work at hand`; `painstaking research`; `scrupulous attention to details`
controlled by or done according to conscience; scrupulous: a conscientious judge. · meticulous; careful; painstaking; particular: conscientious application to the work at hand.
[ASVAB glossary] characterized by extreme care and great effort characterized by extreme care and great effort[Intelligent words] characterized by extreme care and great effort