From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. Performing, or ready to perform, the duties required by one who has the right to claim submission, obedience, or deference; submissive to natural or legal superiors; obedient, as to parents or superiors; as, a dutiful son or daughter; a dutiful ward or servant; a dutiful subject.
From WordNet (r) 3.0 (2006) [wn]:
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