Tracing Definition Of Maruf And Munkar From Sources
Riba is munkar but could be made debatable just like pig for some resemblance with trade or investment. That is why God gave His verdict that is haram. The definition you provided is good enough to know the meanings of maruf and Munkar. Any Arabic dictionary will tell the same. That what is good and bad with intellect is good and bad with shariah. The injunctions of Deen regarding good and bad within religion are called Amr and nahi. Plural awaamir and Nawaahi like saying prayer and keeping fast etc