/ˌɪmprəˈpraɪəti ||; ˌɪmprəˈpraɪətɪ/noun [U] [C] (plural improprieties) (formal 正式) behaviour or actions that are morally wrong or not appropriate 下流或不适当的行为: She was unaware of the impropriety of her remark. 她不知道自己说话造次了。