The phrase "bad rap" is commonly used to describe a negative reputation or false accusations against someone or something. It can also refer to undeserved criticism or blame. Synonyms for "bad rap" include unfair judgment, slander, defamation, vilification, disparagement, and mudslinging. These phrases all suggest that someone or something has been wrongly characterized in a negative way. Other words that convey a similar sentiment include libel, character assassination, tarnished reputation, and smear campaign. Whether intentional or not, a bad rap can be damaging to a person or entity's credibility and image. It's important to consider the validity and truthfulness of negative accusations before accepting them as fact.