foul
noun
an act that violates the rules of a sport
verb
hit a foul ball
make impure
“The industrial wastes polluted the lake”
become or cause to become obstructed
“The leaves clog our drains in the Fall”
“The water pipe is backed up”
commit a foul; break the rules
spot, stain, or pollute
“The townspeople defiled the river by emptying raw sewage into it”
make unclean
“foul the water”
become soiled and dirty
adjective
highly offensive; arousing aversion or disgust
“a disgusting smell”
“distasteful language”
offensively malodorous
“a foul odor”
“the kitchen smelled really funky”
violating accepted standards or rules
“a dirty fighter”
“used foul means to gain power”
(of a baseball) not hit between the foul lines
Oppositesfair(of a manuscript) defaced with changes
“foul (or dirty) copy”
characterized by obscenity
“had a filthy mouth”
“foul language”
disgustingly dirty; filled or smeared with offensive matter
“as filthy as a pigsty”
“a foul pond”
especially of a ship's lines etc
“with its sails afoul”
“a foul anchor”
Source: WordNet 3.1, Princeton University
