There are numerous synonyms that one could use to describe an evil person. One of the most common is "villain," which conjures up images of a despicable character who delights in causing harm and chaos. "Malefactor" is another synonym that can be used to denote someone who is guilty of committing a crime or wrongdoing. Additionally, "malevolent" is a fitting term for individuals who have a deep-seated desire to inflict harm on others, while "diabolical" suggests that a person is not just evil but actively enjoys causing others pain and suffering. Other possible synonyms include "wicked," "malicious," and "sinister," all of which capture the sense of malevolence and malice inherent in such a character.