せっせと の訳語→ active assiduously busily constantly diligently duly dutifully heartily industriously systematic systematically voraciously
周到に の訳語→ careful carefully meticulously
丹念に の訳語→ attentively clever closely examination faithfully methodically neatly patiently thoroughly
念入りに の訳語→ checkup further perfectly scrupulous splendidly thorough