Baddie is a slang term that is commonly used to describe someone who is bad or evil. There are many synonyms for the word baddie that can be used to describe someone who is not good or is behaving in a way that is unacceptable. These synonyms include villain, scoundrel, rogue, antagonist, troublemaker, miscreant, delinquent, outlaw, thug, and criminal. All of these words can be used interchangeably with baddie to describe someone who is not behaving in a positive manner. Using these synonyms can help add variety to your writing or speech, allowing you to describe someone who is behaving badly in different ways.