In Kantian ethics, a moral obligation that allows some discretion in how and when it is fulfilled. Duties of virtue that require judgment about application, like helping others or developing talents.
From Latin 'imperfectus' (incomplete, not finished) and duty. Kant distinguished imperfect from perfect duties to show that some moral obligations allow flexibility in their implementation.
Imperfect duties are like moral guidelines with built-in flexibility—you must help others, but you get to choose how, when, and whom to help. It's why charity is required but you're not obligated to give to every person who asks.
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