painstaking

adjective

careful, meticulous, thorough, assiduous, sedulous, attentive, diligent, industrious, laborious, hard-working, conscientious, ultra-careful, punctilious, scrupulous, demanding, exacting, searching, close, elaborate, minute, accurate, correct, studious, rigorous, particular;

religious, strict;

pedantic, fussy.

▷antonyms careless, negligent, slapdash.

painstaking Oxford Dictionary of English