1) Conscientiously 2) Consistently 3) Deferentially 4) Devotedly 5) Faithfully 6) In a dutiful manner 7) Loyally 8) Meekly 9) Out of a sense of duty 10) Reliably 11) Submissively 12) Tamely 13) Thoroughly 14) Unfailingly 15) Unquestioningly 1) Faithfully 2) Sensibly 
[adv] - out of a sense of duty
adverb out of a sense of duty; in a dutiful manner; `he dutifully visited his mother every Sunday`