IPA: /ˈdjuːtɪfəl/
KK: /ˈdjuːtɪfəl/
Showing a strong sense of responsibility and doing what is expected or required.
She is a dutiful student who always completes her assignments on time.
Dutiful → It is formed from "duty" (from Old French *deu*, meaning owed or due) and "-ful" (meaning full of). The word "dutiful" means full of duty or showing a sense of obligation.
Think of being 'full of duty' — that's what 'dutiful' means.