diligently UK /ˈdɪlɪd͡ʒ(ə)ntli/US /ˈdɪləd͡ʒən(t)li/ adverb1 •In a diligent manner, with appropriate effort, carefully.Instead, empty bags were folded diligently into the corners of underpacked suitcases, waiting to be jammed full with the familiar objects of home. — 2001 formsmore diligently · most diligently