Similar words: dutifully, beautiful, beautifully, pitiful, plentiful, pitifully, bountiful, plentifully. Meaning: ['duːtɪfʊl /'djuːt-] 
adj. willingly obedient out of a sense of duty and respect.
adj. willingly obedient out of a sense of duty and respect. 
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31) He is always a dutiful person, so will not go off the rails.
32) Your electric toothbrush will beep to notify you that dutiful brushing twice a day every day for the past six months has earned you enough points for a 10 percent discount on your next checkup.
33) He wonderfully cheered up , his dutiful manner vanishing in a great grin and a strong hug.
More similar words: dutifully, beautiful, beautifully, pitiful, plentiful, pitifully, bountiful, plentifully, duties, merciful, fanciful, beautify, duty, Dutch, on duty, off duty, duteous, jury duty, stamp duty, heavy duty, bifurcate, centrifuge, dutch treat, dutch courage, bifurcation, customs duty, breach of duty, centrifugal force, notify, motif.