What Is A Disloyal Person Called?

What Is A Disloyal Person Called? Some common synonyms of disloyal are faithless, false, perfidious, traitorous, and treacherous. What do you call an Unloyal person? Judas. noun. someone who hurts a friend by behaving in a way that is not loyal. What do you call someone who is not loyal? faithless, false, disloyal, traitorous, treacherous,