The phrase "dregs of society" is often used to describe the lowest and most undesirable members of a community, but there are a variety of synonyms that can be used to convey similar sentiments. Some possible synonyms include "scum," "riffraff," "miscreants," "outcasts," "pariahs," "degenerates," "ne'er-do-wells," "freeloaders," "leeches," "bottom-feeders," "undesirables," and "wastrels." These terms all carry negative connotations and are typically used to describe individuals who are seen as unproductive, unethical, or otherwise undesirable. However, it's worth noting that some of these synonyms may also be considered derogatory or offensive, so it's important to use them carefully and with consideration for the audience and context.