What is another word for bounden duty?
Pronunciation: [bˈa͡ʊndən djˈuːti] (IPA) 
The phrase "bounden duty" is often used to describe a moral obligation that one is obliged to perform. However, there are numerous synonyms for this phrase that convey a similar sense of responsibility. "Sacred obligation" implies a deep sense of duty that one has to honor. "Moral imperative" suggests that one has a strong conviction that an action must be taken. "Legal obligation" indicates a duty that is enforced by law, while "civic duty" refers to one's responsibility to contribute to society. "Conscientious obligation" implies a sense of duty that arises from one's personal values and beliefs. All of these synonyms indicate a sense of responsibility that one feels compelled to fulfill.
