Fiend/fiːnd/ Definition 1 of 4Pro Tip 1/3Supernatural Being Used to describe malevolent supernatural beings in stories and mythology. The ancient texts spoke of a fiend that haunted the forest. Pro Tip 2/3Historical Usage Historically more common when talking about evil entities, less used this way today. In medieval times, they would often blame misfortunes on fiends. Pro Tip 3/3Literary Flair Adds a dramatic effect in literature or storytelling, suggesting great wickedness. The villain in the novel was not just a criminal, but a true fiend.