If you're looking for synonyms for "wert foul-mouthed," there are numerous alternatives you can use. Some of the more common synonyms include vulgar, profane, obscene, crude, indecent, or lewd. Other possible synonyms include foul, obscene language, gutter language, cussing, or swearing. Depending on the context in which you're using the term, you might also consider using more specific synonyms like blasphemous, sacrilegious, or scatological. Regardless of the specific synonym you choose, all of these terms generally refer to language that is considered offensive or inappropriate in polite company.