The Oxford Thesaurus An A-Z Dictionary of Synonyms - scrupulousadj.

1) careful, cautious, meticulous, exacting, precise, over-nice, strict, rigid, rigorous, severe, critical, fastidious, neat, conscientious, finicky or finical, fussy, painstaking, punctilious: Andrew has always been scrupulous about his toys, his books, his clothes, etc. 2) ethical, honourable, upstanding, moral, righteous, principled, high-minded, just: Meg was always scrupulous in her business dealings.