Riff-raff, a term commonly used to describe people considered undesirable or low-class, has a variety of synonyms that can be used to convey similar meanings. These include: scum, lowlifes, trash, rabble, dregs, ne'er-do-wells, miscreants, outcasts, and underclass. Such words are often used to describe individuals who are perceived as being poorly educated, unrefined, or lacking in social status and manners. In addition to personal qualities, they can also denote groups or communities that are viewed negatively, such as those associated with street gangs, drug users, or other types of criminal activity. Ultimately, the choice of synonym will depend on the context in which it is being used and the desired tone of the message.