grossly offensive to the senses; disgustingly loathsome; noisome

a foul smell.

containing or characterized by offensive or noisome matter

foul air; foul stagnant water.

filthy or dirty, as places, receptacles, clothes, etc.

muddy, as a road.

clogged or obstructed with foreign matter

a foul gas jet.

unfavorable or stormy

foul weather.

contrary, violent, or unfavorable, as the wind.

grossly offensive in a moral sense.

abominable, wicked, or vile, as deeds, crime, slander, etc.

scurrilous, profane, or obscene; offensive

foul language.

contrary to the rules or established usages, as of a sport or game; unfair

a foul blow.

Baseball . pertaining to a foul ball or a foul line.

limited in freedom of movement by obstruction, entanglement, etc.

a foul anchor.

abounding in errors or in marks of correction, as a printer's proof, manuscript, or the like.

Nautical .

(of the underwater portion of a hull) encrusted and impeded with barnacles, seaweed, etc.

(of a mooring place) involving inconveniences and dangers, as of colliding with vessels or other objects when swinging with the tide.

(of the bottom of a body of water) affording a poor hold for an anchor ( opposed to clean ).

North England and Scot. . not fair; ugly or unattractive.

Obsolete . disfigured.

in a foul manner; vilely; unfairly.

Baseball . into foul territory; so as to be foul

It looked like a homer when he hit it, but it went foul.

something that is foul.

a collision or entanglement

a foul between two racing sculls.

a violation of the rules of a sport or game

The referee called it a foul.

Baseball . foul ball.

to make foul; defile; soil.

to clog or obstruct, as a chimney or the bore of a gun.

to collide with.

to cause to become entangled or caught, as a rope.

to defile; dishonor; disgrace

His reputation had been fouled by unfounded accusations.

Nautical . (of barnacles, seaweed, etc.) to cling to (a hull) so as to encumber.

Baseball . to hit (a pitched ball) foul (often fol. by off or away )

He fouled off two curves before being struck out on a fastball.

to become foul.

Nautical . to come into collision, as two boats.

to become entangled or clogged

The rope fouled.

Sports . to make a foul play; give a foul blow.

Baseball . to hit a foul ball. ?

foul out,

Baseball . to be put out by hitting a foul ball caught on the fly by a player on the opposing team.

Basketball . to be expelled from a game for having committed more fouls than is allowed.

foul up, Informal . to cause confusion or disorder; bungle; spoil. ?

fall foul or afoul of

to collide with, as ships.

to come into conflict with; quarrel.

to make an attack; assault.

foul one's nest. to dishonor one's own home, family

or the like.

run foul or afoul of

to come into collision or controversy with

to run foul of the press.

adjective

clean , fragrant , pleasing , pure , wonderful , innocent , inoffensive , moral , fair , good , honest , incorrupt , just

verb

clean , purify , sterilize

adjective

abhorrent , abominable , base , contaminated , despicable , detestable , disgraceful , dishonorable , egregious , fetid , filthy , gross * , hateful , heinous , horrid , icky * , impure , infamous , iniquitous , loathsome , malodorous , mucky , nasty , nauseating , nefarious , noisome , notorious , offensive , pigpen * , polluted , putrid , rank * , raunchy * , repellent , repulsive , revolting , rotten , scandalous , shameful , squalid , stinking * , sullied , tainted , unclean , vicious , vile , wicked , yecchy , yucky * , abusive , blasphemous , blue * , coarse , dirty , foul-mouthed , indecent , lewd , low , obscene , profane , raunchy , scatological , scurrilous , smutty * , caitiff , crooked , fraudulent , inequitable , monstrous , shady , underhand , underhanded , unfair , unjust , unscrupulous , atrocious , disgusting , sickening , ugly , unwholesome , foul-smelling , mephitic , reeky , stinking , barnyard , bawdy , broad , fescennine , gross , ribald , scatologic , smutty , vulgar , antipathetic , contemptible , despisable , lousy , mean , obnoxious , odious , repugnant , shabby , wretched , carious , disagreeable , dreggish , dreggy , entangled , feculent , insulting , leprous , noxious , putrescent , roily , treacherous , turbid , unfavorable , unpropitious , vituperative

noun

breach , encroachment , error , faux pas , infringement , offense , slip * , violation , colluvies , feculence , fetidness , foulness , loathsomeness , mephitis , noisomeness , pestilence , pollution , putrefaction , putrescence , putridity , stench

verb

befoul , begrime , besmear , besmirch , block , catch , choke , clog , contaminate , defile , desecrate , discolor , ensnare , entangle , fill , jam , pollute , profane , smear , smudge , snarl , soil , spot , stain , sully , taint , tarnish , twist , poison , ensnarl , tangle , abusive , base , bawdy , blocked , contaminated , corrupt , defaced , defame , detestable , dirty , disgusting , dishonorable , entangled , filthy , grimy , gross , horrid , illegal , impure , indecent , lewd , loathsome , muddy , nastiness , nasty , nauseating , obnoxious , obscene , odious , offensive , polluted , putrid , raunchy , repulsive , revolting , rotten , smelly , soiled , stink , stinking , unclean , unfair , unsportsmanlike , vicious , vile , vulgar , wicked , wretched

phrasal verb

ball up , blunder , boggle , bungle , fumble , gum up , mess up , mishandle , mismanage , muddle , muff , spoil