/ ˌɪmprəˈpraɪəti; NAmE / noun
[ U , C ] ( pl. -ies ) ( formal ) behaviour or actions that are dishonest, morally wrong or not appropriate for a person in a position of responsibility
OPP propriety
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WORD ORIGIN
early 17th cent. (also in the sense inaccuracy ): from French impropriété or Latin improprietas , from improprius , from in- not + proprius one's own, proper.