Loud-mouthed is a negative term used to describe someone who talks in a loud and irritating manner. However, there are many synonyms for this term that can be used in various contexts. Some of the synonyms of loud-mouthed are garrulous, boisterous, blustering, vociferous, and raucous. These words are perfect for describing someone's behavior that is loud and annoying to other people. Other synonyms to be considered are noisy, talkative, chatty, and loquacious. These words may have a less negative connotation than loud-mouthed, but they still convey the same meaning. It is up to the user to decide which word best fits their intended tone and meaning.