diligentˈdɪl ɪ dʒənt
diligent, persevering (adj)
quietly and steadily persevering especially in detail or exactness
"a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business"
characterized by care and perseverance in carrying out tasks
"a diligent detective investigates all clues"; "a diligent search of the files"
Performing with intense concentration, focus, responsible regard.
Constant in effort to accomplish something; attentive and persistent.