Noah Webster's Dictionary (a.) Using language scurrilous, opprobrious, obscene, or profane; abusive.

Multi-Version Concordance Foul-mouthed (1 Occurrence) Colossians 3:8 But now you must rid yourselves of every kind of sin--angry and passionate outbreaks, ill-will, evil speaking, foul-mouthed abuse--so that these may never soil your lips. (WEY)