/ Dictionary / Index F foulmouthed: Meaning and Definition of Find definitions for: foul•mouthed Pronunciation: (foul'moud', -moutht'), [key] — adj. using obscene, profane, or scurrilous language; given to filthy or abusive speech. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. foul matter foulness Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language