foul

v.

[1]	pollute , contaminate
[2]	clog , choke off , clog up , back up , congest , choke
[3]	befoul , defile , maculate
[4]	dirty , pollute , sully , befoul , defile , soil , contaminate , adulterate , taint
[5]	tangle , entangle , catch , snare , ensnare , enmesh , snag , snarl , jam , twist
[6]	disgrace , dishonour , sully , taint , besmirch , defile , soil , stain , smear , tarnish , blacken , denigrate , debase , degrade , abase , demean , disparage , defame , derogate , asperse , devaluate , depreciate , vitiate , belittle , discredit , bring/call into disrepute
[7]	obstruct , block , choke , stop/plug/clog (up)
[8]	foul up , mismanage , mishandle , botch , bungle , make a mess (of) , mess up , spoil , ruin , (Colloq) muff , (Brit) throw a spanner in(to) (the works) , (US) throw a monkey wrench into (the machinery) , (Slang) muck up , goof (up) , blow , screw up , louse up , (Mainly Brit) bugger (up) , (US/Canadian) snafu

n.

[1]	violation , infringement , infraction , illegality

adv.

[1]	afoul , in conflict , in trouble , in violation

adj.

[1]	offensive , loathsome , disgusting , obnoxious , revolting , repulsive , repellent , repugnant , sickening , nauseous , nauseating , nasty , beastly , (Archaic) fulsome
[2]	filthy , unclean , nasty , polluted , putrid , putrescent , putrefactive/putrefacient , defiled , soiled , spoiled , rotten , decayed , decomposed , rancid , soured , turned , tainted , mouldy , impure , adulterated , contaminated , stale , bad , (Brit) off
[3]	smelly , stinking , noisome , fetid/foetid , rank , evil-smelling , foul-smelling , malodorous , musty , mephitic , graveolent
[4]	wicked , vile , bad , base , abominable , low , sordid , iniquitous , evil , flagitious , atrocious , monstrous , nefarious , sinful , immoral , amoral , vicious , villainous , scandalous , infamous , dishonourable , shameful , disgraceful , ignominious , detestable
[5]	dirty , obscene , filthy , profane , scatological , gross , smutty , foul-mouthed , blue , licentious , salacious , lewd , indecent , improper , coarse , uncouth , vulgar , rude , scurrilous , rough , indelicate , immodest , off colour , suggestive , bawdy , ribald , Rabelaisian , Fescennine , (US) raw , (Slang) raunchy
[6]	abusive , offensive , affronting , insulting , disparaging , maligning , thersitical , calumnious/calumniatory , aspersive , slanderous , defamatory , libellous , denigrating , derogatory , deprecatory/deprecative , depreciatory/depreciative , denunciatory/denunciative , derisory , derisive , scornful , belittling , fulminous , objurgatory/objurgative , vituperative , invective
[7]	dishonest , unfair , unjust , unsportsmanlike , dishonourable , fraudulent , underhand(ed) , double-dealing , two-faced , corrupt , venal , dirty , treacherous , perfidious , traitorous , unscrupulous , (Colloq) crooked , shady , (Slang) (Mainly Brit) bent
[8]	nasty , dangerous , rough , disagreeable , unfavourable , sloppy , stormy , adverse , windy , blustery , snowy , sleety , wet , rainy
[9]	obstructed , disgusting , disgustful , blocked , choked , distasteful , loathly , stopped (up) , plugged (up) , loathsome , repellent , clogged (up) , repellant , repelling , revolting , skanky , wicked , yucky
[10]	fetid , tangled , entangled , foetid , foul-smelling , caught , ensnared , funky , noisome , enmeshed , snarled , smelly , stinking , ill-scented
[11]	cheating , illegal , prohibited , dirty , unsporting , forbidden , interdicted , unsportsmanlike , not fair , dirty
[12]	dirty , marked-up
[13]	cruddy , filthy , nasty , smutty
[14]	filthy , nasty
[15]	afoul , fouled