offensive to the senses, especially through having a disgusting smell or taste or being dirty

a foul odour

his foul breath

wicked or immoral

murder most foul

containing or full of noxious matter; polluted

foul, swampy water

(of the weather) wet and stormy

he walked in fair and foul weather

the weather turned foul

(in sport) an unfair or invalid stroke or piece of play, especially one involving interference with an opponent

the midfielder was booked for a foul on Ford

a disease in the feet of cattle

he was indeed suffering from foul of the foot

contrary to the rules; unfairly

make foul or dirty; pollute

factories which fouled the atmosphere

(in sport) commit a foul against (an opponent)

United claim their keeper was fouled

collide with or obstruct

the ships became overcrowded and fouled each other

will have to work towards solutions to prevent trucks from fouling railroad tracks