#1 foul v. hit a foul ball. wn
#2 foul s. [fetid, foetid, foul-smelling, funky, noisome, smelly, stinking, ill-scented] offensively malodorous; "a foul odor"; "the kitchen smelled really funky". wn
#3 foul v. [pollute, contaminate] make impure; "The industrial wastes polluted the lake". wn
#4 foul s. [cheating, dirty, unsporting, unsportsmanlike] violating accepted standards or rules; "a dirty fighter"; "used foul means to gain power"; "a nasty unsporting serve"; "fined for unsportsmanlike behavior". wn
#5 foul n. an act that violates the rules of a sport. wn
vizzz