A personality trait that would describe the person who possesses it to be cold, mean, or sly; most times the person being described in this sense will at first appear normal, contrary to an outright jerk. Used to describe a troublemaker or sadist.
Loki from "Thor" {Dark World as well}, "The Avengers", and from Marvel comics is described as devilishly handsome, as he has a two-timing personality that is mischievous and alluring, with matching good looks.
When a man is handsome but in a more devious-looking or sinister-looking way. Usually associated with darker hair, larger eyes, gaunter faces and dangerous charm. Possibly includes extravagantfacial hair.
"Did you see Alehandro's new moustache-goatee combo? It makes him look like a cartoon villain!"