foul

Adjective

• especially of a ship's lines etc
  • with its sails afoul
    
  • a foul anchor
    

• disgustingly dirty; filled or smeared with offensive matter
  • as filthy as a pigsty
    
  • a foul pond
    
  • a nasty pigsty of a room
    

• characterized by obscenity
  • had a filthy mouth
    
  • foul language
    
  • smutty jokes
    

• (of a manuscript) defaced with changes
  • foul (or dirty) copy
    

• (of a baseball) not hit between the foul lines

• violating accepted standards or rules
  • a dirty fighter
    
  • used foul means to gain power
    
  • a nasty unsporting serve
    
  • fined for unsportsmanlike behavior
    

• offensively malodorous
  • a foul odor
    
  • the kitchen smelled really funky
    

• highly offensive; arousing aversion or disgust
  • a disgusting smell
    
  • distasteful language
    
  • a loathsome disease
    
  • the idea of eating meat is repellent to me
    
  • revolting food
    
  • a wicked stench
    

Noun

• an act that violates the rules of a sport

Verb

• become soiled and dirty

• make unclean
  • foul the water
    

• spot, stain, or pollute
  • The townspeople defiled the river by emptying raw sewage into it
    

• commit a foul; break the rules

• become or cause to become obstructed
  • The leaves clog our drains in the Fall
    
  • The water pipe is backed up
    

• make impure
  • The industrial wastes polluted the lake
    

• hit a foul ball

Related words

• Synonyms: 
  afoul(ip) , fouled , filthy , nasty , cruddy , smutty , dirty , marked-up , cheating(a) , unsporting , unsportsmanlike , fetid , foetid , foul-smelling , funky , noisome , smelly , stinking , ill-scented , befoul , defile , maculate , clog , choke off , clog up , back up , congest , choke , pollute , contaminate
• Antonyms: 
  fair , unclog