diligently

Entry Definition
s/he works hard, works diligently, works constantly
s/he is a hard worker, is diligent worker
it is done with perseverance or diligence; it is demanding or rigorous
s/he keeps at it, perseveres at it, does it diligently
s/he tries very hard, perseveres, struggles to reach goal, is diligent; s/he is busy
s/he keeps studying hard, keeps studying diligently