painstaking

Synonyms: assiduous by the book by the numbers careful conscientious conscionable diligent earnest exact exacting finicky fussbudget fussy hard-working heedful industrious particular persevering persnickety picky punctilious punctual scrupulous sedulous stickler strenuous thoroughgoing

Antonyms: careless easy half-baked half-done thoughtless unmindful unthorough