1. made dirty, polluted, or contaminated
Usage: past participle of ‘befoul’ used as adjective

Examples

• The befouled water was unfit for drinking.
• Birds struggled to fly with their befouled feathers covered in oil.
• The befouled air made it difficult to breathe near the factory.
• Protesters demanded cleanup of the befouled river.
• The befouled beach was closed to swimmers.
• Heavy rains washed the befouled streets clean.