The Collaborative International Dictionary of English v.0.48:
Conscientiously \Con`sci*en"tious*ly\, adv. In a conscientious manner; as a matter of conscience; hence; faithfully; accurately; completely. [1913 Webster]WordNet (r) 3.0 (2006):
conscientiously adv 1: with extreme conscientiousness; "he came religiously every morning at 8 o'clock" [syn: scrupulously, conscientiously, religiously]