foul

1 of 4

adjective

ˈfau̇(-ə)l 

1

a

: offensive to the senses : loathsome

the foul odor of rotten eggs

b

: filled or covered with offensive matter

foul bins of filth

2

: being odorous and impure : polluted

foul air

3

a

: morally or spiritually odious : detestable

a foul crime

b

: notably unpleasant or distressing : wretched, horrid

in a foul mood

4

: obscene, abusive

foul language

5

a

: being wet and stormy

foul weather

b

: obstructive to navigation

a foul tide

6

a

: treacherous, dishonorable

fair means or foul

b

: constituting an infringement (see infringe sense 1) of rules in a game or sport

a foul blow in boxing

7

: being outside the foul lines in baseball

… a foul fly that was snagged by a fan in the stands.

—E. M. Swift

8

: containing marked-up corrections

a foul manuscript

foul proofs

9

: full of dirt or mud

10

: encrusted, clogged, or choked with a foreign substance

the chimney was foul and smoked badly

11

: placed in a situation that impedes physical movement : entangled

a foul fishing line

12

dialectal British : homely, ugly

foully

ˈfau̇(l)-lē 

adverb

foulness noun

foul

2 of 4

noun

1

a

: an infringement of the rules in a game or sport

b

: free throw

2

: foul ball

3

: an entanglement or collision especially in angling or sailing

4

archaic : something foul

foul

3 of 4

verb

fouled; fouling; fouls

transitive verb

1

: to make foul: such as

a

: to make dirty : pollute

b

: to tangle or come into collision with

c

: to encrust with a foreign substance

a ship's bottom fouled with barnacles

d

: obstruct, block

2

: dishonor, discredit

3

: to commit a foul against

4

: to hit (a baseball) foul

intransitive verb

1

: to commit a violation of the rules in a sport or game

2

: to hit a foul ball

3

: to become or be foul: such as

a

: decompose, rot

b

: to become encrusted, clogged, or choked with a foreign substance

c

: to become entangled or come into collision

foul

4 of 4

adverb

: in a foul manner : so as to be foul

Synonyms

Adjective

• bleak
• dirty
• inclement
• nasty
• raw
• rough
• squally
• stormy
• tempestuous
• turbulent

Verb

• befoul
• begrime
• bemire
• besmirch
• blacken
• daub
• dirty
• distain [archaic]
• gaum [dialect]
• grime
• mire
• muck
• muddy
• smirch
• smudge
• soil
• stain
• sully

Choose the Right Synonym for foul

dirty, filthy, foul, nasty, squalid mean conspicuously unclean or impure.

dirty emphasizes the presence of dirt more than an emotional reaction to it.

a dirty littered street

filthy carries a strong suggestion of offensiveness and typically of gradually accumulated dirt that begrimes and besmears.

a stained greasy floor, utterly filthy

foul implies extreme offensiveness and an accumulation of what is rotten or stinking.

a foul-smelling open sewer

nasty applies to what is actually foul or is repugnant to one expecting freshness, cleanliness, or sweetness.

it's a nasty job to clean up after a sick cat

In practice, nasty is often weakened to the point of being no more than a synonym of unpleasant or disagreeable.

had a nasty fall

his answer gave her a nasty shock

squalid adds to the idea of dirtiness and filth that of slovenly neglect.

squalid slums

All these terms are also applicable to moral uncleanness or baseness or obscenity.

dirty then stresses meanness or despicableness

don't ask me to do your dirty work

, while filthy and foul describe disgusting obscenity or loathsome behavior

filthy street language

a foul story of lust and greed

, and nasty implies a peculiarly offensive unpleasantness.

a stand-up comedian known for nasty humor

Distinctively, squalid implies sordidness as well as baseness and dirtiness.

engaged in a series of squalid affairs

Examples of foul in a Sentence

Adjective

the foul odor of rotten eggs

The medicine left a foul taste in my mouth.

The weather has been foul all week.

Noun

He hit several fouls in a row.

Verb

pollutants that foul the air

She fouled on her first long jump attempt.

He was fouled as he attempted the shot.

He kept fouling pitches into the stands.

Recent Examples on the Web

Adjective

Other signs to look for are floating debris, rust, mildew, or foul odors. —Ashlyn Needham, Southern Living, 6 Dec. 2024

There’s also an odor neutralizer cartridge that can be placed into the vacuum’s brush roll and is is designed to keep foul odors out of the air while cleaning. —Terri Williams, Architectural Digest, 2 Dec. 2024

Noun

Bruno Fernandes would make a cynical foul to stop the resultant Plzen counter-attack, and from the free-kick after that Andre Onana would collide and hurt Casemiro. —Carl Anka, The Athletic, 13 Dec. 2024

The personal 7-0 run from the breakout sophomore helped build UConn’s lead to 35-16 with just over five minutes to go in the opening half, even as centers Johnson and Reed sat on the bench with two fouls a piece. —Joe Arruda, Hartford Courant, 9 Dec. 2024

Verb

The Rockets want to control the glass, run the floor in transition and defend aggressively without fouling, but the absence of a true pecking order rears its head at the wrong times, especially in crunchtime. —Eric Koreen, The Athletic, 22 Nov. 2024

Even uglier: There then was a lengthy delay with 8:46 to play in the third period, on a sequence that began with a Herro drive and ended with Herro being fouled by the Pistons forward Tim Hardaway Jr. —Ira Winderman, Sun Sentinel, 13 Nov. 2024

Adverb

Ramirez’s lineout concluded a grueling a nine-pitch encounter Rodon got ahead with his changeup, watched Ramirez foul off three of the next four pitches, take two balls to even the count, foul of f a fastball. —Larry Fleisher, Forbes, 15 Oct. 2024

The foul allowed Stewart to tie the game with two free throws, clearing the way for the Liberty to rally in extra time and win 67-62. —Doha Madani, NBC News, 21 Oct. 2024

Word History

Etymology

Adjective and Noun

Middle English, from Old English fūl; akin to Old High German fūl rotten, Latin pus pus, putēre to stink, Greek pyon pus

First Known Use

Adjective

before the 12th century, in the meaning defined at sense 1a

Noun

before the 12th century, in the meaning defined at sense 4

Verb

before the 12th century, in the meaning defined at intransitive sense 1

Adverb

13th century, in the meaning defined above

Phrases Containing foul

• cry foul
• fall foul of
• foul ball
• foul line
• foul mouth
• foul of
• foul out
• foul play
• foul shot
• foul tip
• foul trouble
• foul up
• personal foul
• professional foul
• team foul
• technical foul

Kids Definition

foul

1 of 4 adjective

ˈfau̇(ə)l 

1

a

: disgusting in looks, taste, or smell

foul odor

b

: full of or covered with dirt

foul clothes

2

a

: detestable

a foul crime

b

: notably unpleasant or bad

a foul mood

c

: being vulgar or insulting

foul language

3

: being wet and stormy

foul weather

4

a

: very unfair

fair means or foul

b

: breaking a rule in a game or sport

a foul blow in boxing

5

: being outside the foul lines in baseball

a foul grounder

foully

ˈfau̇(l)-lē 

adverb

foulness

ˈfau̇(ə)l-nəs

noun

foul

2 of 4 noun

1

: an entanglement or collision in fishing or sailing

2

a

: a breaking of the rules in a game or sport

b

: free throw

3

: foul ball

foul

3 of 4 verb

1

: to make or become foul or filthy

foul the air

foul a stream

2

a

: to make a foul in a game or sport

b

: to hit a foul ball

3

: to become or cause to become entangled

foul the lines

foul

4 of 4 adverb

: in a foul manner : so as to be foul