Adjectives

(a)diligentcharacterized by care and perseverance in carrying out tasks“a diligent detective investigates all clues”, “a diligent search of the files”
(s)diligent, perseveringquietly and steadily persevering especially in detail or exactness“a diligent (or patient) worker”, “with persevering (or patient) industry she revived the failing business”