Source : Webster's Revised Unabridged Dictionary (1913)

Conscientiously \Con`sci*en"tious*ly\, adv.
   In a conscientious manner; as a matter of conscience; hence;
   faithfully; accurately; completely.

Source : WordNet®

conscientiously
     adv : with extreme conscientiousness; "he came religiously every
           morning at 8 o'clock" [syn: {scrupulously}, {religiously}]