1. the quality or state of being foul; extreme unpleasantness or offensiveness in smell, taste, or appearance
2. morally or ethically offensive behavior; wickedness or depravity
3. obscene or vulgar language; profanity
Usage: informal

Examples

• The foulness of the stagnant water made it impossible to drink.
• The foulness of his language shocked everyone in the room.
• She was appalled by the foulness of the conditions in the abandoned building.
• The foulness of his character became apparent over time.
• The air carried the foulness of rotting garbage.
• His foulness of speech was legendary among his peers.