When people badmouth someone, they often use negative and harmful words to criticize them. However, there are several other words that can be used instead of badmouth. Some of these words include criticize, slander, defame, malign, disparage and belittle. Criticize means to express disapproval or to point out faults, while slander and defame refer to making false accusations that can damage someone's reputation. Malign is to speak evil or spurious words, while disparage and belittle refers to making someone appear less important or capable. Using these words can help avoid negative and hurtful language, and instead provide a more thoughtful and constructive criticism.