The English language is rich with words and phrases to describe those who engage in wicked or nefarious activities. Some synonyms for "evil-doer" include miscreant, malefactor, wrongdoer, criminal, villain, offender, delinquent, scoundrel, reprobate, and scallywag. While these words all convey a similar meaning, they each have their own nuances. For example, a miscreant may act against society's laws or moral standards, while a malefactor is someone who commits a specific crime. A scoundrel is typically thought of as being sneaky and deceitful, while a delinquent is someone who has failed to meet their responsibilities or obligations. Ultimately, the choice of synonym will depend on the context in which it is being used.