painstaking

assiduous, diligent, indefatigable, persevering, sedulous

exhaustive, thorough, thoroughgoing

alert, attentive, observant, vigilant, watchful

accurate, exact, precise, strict

critical, demanding, discriminating, exacting, fastidious, finicky, particular

cautious, chary, circumspect, gingerly, guarded, heedful, mindful, wary

deliberate, plodding, slow

studied, thoughtful

all-out, determined, dogged, intensive, patient, tenacious, tireless, zealous