foul

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Offensive to the senses; revolting.
2. adj. Having an offensive odor; smelly.
3. adj. Rotten or putrid: foul meat.
4. adj. Full of dirt or mud; dirty. See Synonyms at dirty.
5. adj. Full of impurities; polluted: foul air.
6. adj. Morally detestable; wicked: foul deeds.
7. adj. Of a vulgar or obscene nature: foul language.
8. adj. Very disagreeable or displeasing; horrid: a foul movie.
9. adj. Bad or unfavorable: in fair weather or foul.
10. adj. Violating accepted standards or rules; dishonorable: used foul means to gain power.
11. adj. Sports Contrary to the rules of a game or sport: a foul boxing punch.
12. adj. Baseball Outside the foul lines: a foul fly ball.
13. adj. Entangled or twisted: a foul anchor.
14. adj. Clogged or obstructed; blocked: a foul ventilator shaft.
15. adj. Archaic Ugly; unattractive.
16. n. Sports An infraction or a violation of the rules of play.
17. n. Baseball A foul ball.
18. n. An entanglement or a collision.
19. n. An instance of clogging or obstructing.
20. adv. In a foul manner.
21. v. To make dirty or foul; pollute. See Synonyms at contaminate.
22. v. To bring into dishonor; besmirch.
23. v. To clog or obstruct.
24. v. To entangle or catch (a rope, for example).
25. v. Nautical To encrust (a ship's hull) with foreign matter, such as barnacles.
26. v. Sports To commit a foul against.
27. v. Baseball To hit (a ball) outside the foul lines.
28. v. To become foul.
29. v. Sports To commit a foul.
30. v. Baseball To hit a ball outside the foul lines: fouled twice and then struck out; fouled out to the catcher.
31. v. To become entangled or twisted: The anchor line fouled on a rock.
32. v. To become clogged or obstructed.
33. foul out Sports To be put out of a game for exceeding the number of permissible fouls.
34. foul up To blunder or cause to blunder because of mistakes or poor judgment.

Century Dictionary and Cyclopedia

1. Grossly offensive to the senses; of a filthy or noxious character or quality; noisome; disgusting: as, foul matter or exudations; a foul smell; foul breath.
2. 2. Of a harmful or mischievous character; causing trouble or annoyance; obnoxious; obstructive; clogging: as, foul weeds; foul weather; a foul wind.
3. Affected by noisome or defiling matter; in a filthy state or condition; unclean; dirty; turbid; defiled: as, foul clothing; foul den; a foul stream.
4. Affected by harmful matter or things; obstructed by anything fixed or attached; clogged; choked: as, a foul garden (one full of weeds); a foul chimney (one choked with soot); the ship's bottom is foul (clogged with seaweeds or barnacles); the channel has a foul bottom (one cumbered by rocks, wrecks, or the like).
5. Clogged or impeded as by collision or entanglement; in a state of obstructing contact or involvement: with of before the obstructive object: as, the ship is foul of a rock or of another ship; a rope or an anchor is foul from being jammed, entangled, or clogged in any way.
6. Contrary to or violating rule or established usage; done, acting, or acted upon improperly; irregular; disorderly; unfair: as, a foul blow or stroke: a foul player or fighter; a foul attack. See foul play, below.
7. Grossly offensive or loathsome in a moral sense; manifesting, or prompted or actuated by, base or vicious feeling; vile; odious; shameful; revolting: as, foul thoughts or actions; foul language; a foul slander, murder, conspiracy, etc.; a foul slanderer or conspirator.
8. Extremely bad as to effect or result; unfavorable; unlucky; pernicious; distressing: us, a foul accident; a foul prospect or omen.
9. Coarse; common; of little value.
10. Ill-favored; ugly; homely.
11. To attack; make an assault upon. See afoul.
12. n. The act of fouling, colliding, or otherwise impeding due motion or progress; specifically, in a contest of any kind, a violation of the governing rules.
13. n. In base-ball, a hit which makes the ball land outside the lines from home to first or to third base continued indefinitely; a foul ball or a foul hit. See base-ball.
14. n. An ulcer in a cow's foot; a disease that produces ulcers.
15. In a foul manner.
16. To make foul, in any sense; befoul. To defile; duty; soil.
17. Nautical, to entangle.
18. To become foul or dirty: as, a gun. fouls from long use.
19. Nautical, to come into collision, as two boats; become entangled or clogged: as, the rope fouled; the block fouled.
20. In base-ball, to strike a foul ball
21. n. An obsolete spelling of fowl.

Wiktionary

1. adj. Covered with, or containing, extraneous matter which is injurious, noxious, offensive, or obstructive; filthy; dirty; not clean; polluted; nasty; defiled; as, a foul cloth; foul hands; a foul chimney; foul air; a ship's bottom is foul when overgrown with barnacles; a gun becomes foul from repeated firing; a well is foul with polluted water.
2. adj. Scurrilous; obscene or profane; abusive; as, foul words; foul language.
3. adj. Hateful; detestable; shameful; odious; wretched.
4. adj. Loathsome; disgusting; as, a foul disease.
5. adj. Ugly; homely; poor.
6. adj. Not favorable; unpropitious; not fair or advantageous; as, a foul wind; a foul road; cloudy or rainy; stormy; not fair; -- said of the weather, sky, etc.
7. adj. Not conformed to the established rules and customs of a game, conflict, test, etc.; unfair; dishonest; dishonorable; cheating; as, foul play.
8. adj. nautical Having freedom of motion interfered with by collision or entanglement; entangled; -- opposed to clear; as, a rope or cable may get foul while paying it out.
9. adj. baseball Outside of the base lines; in foul territory.
10. v. transitive To make dirty.
11. v. transitive To besmirch.
12. v. transitive To clog or obstruct.
13. v. transitive, nautical To entangle.
14. v. transitive, basketball To make contact with an opposing player in order to gain advantage.
15. v. transitive, baseball To hit outside of the baselines.
16. v. intransitive To become clogged.
17. v. intransitive To become entangled.
18. v. intransitive, basketball To commit a foul.
19. v. intransitive, baseball To hit a ball outside of the baselines.
20. n. sports A breach of the rules of a game, especially one involving inappropriate contact with an opposing player in order to gain an advantage; as, for example, foot-tripping in soccer, or contact of any kind in basketball.
21. n. bowling A (usually accidental) contact between a bowler and the lane before the bowler has released the ball.
22. n. baseball A foul ball, a ball which has been hit outside of the base lines.

GNU Webster's 1913

1. n. obsolete A bird.
2. adj. Covered with, or containing, extraneous matter which is injurious, noxious, offensive, or obstructive; filthy; dirty; not clean; polluted; nasty; defiled.
3. adj. Scurrilous; obscene or profane; abusive.
4. adj. Hateful; detestable; shameful; odious; wretched.
5. adj. Loathsome; disgusting.
6. adj. obsolete Ugly; homely; poor.
7. adj. Not favorable; unpropitious; not fair or advantageous; ; cloudy or rainy; stormy; not fair; -- said of the weather, sky, etc.
8. adj. Not conformed to the established rules and customs of a game, conflict, test, etc.; unfair; dishonest; dishonorable; cheating.
9. adj. Having freedom of motion interfered with by collision or entanglement; entangled; -- opposed to clear.
10. v. To make filthy; to defile; to daub; to dirty; to soil.
11. v. (Mil.) To incrust (the bore of a gun) with burnt powder in the process of firing.
12. v. To cover (a ship's bottom) with anything that impered its sailing.
13. v. To entangle, so as to impede motion; ; to come into collision with.
14. v. To become clogged with burnt powder in the process of firing, as a gun.
15. v. To become entagled, as ropes; to come into collision with something.
16. n. An entanglement; a collision, as in a boat race.
17. n. (Baseball) See Foul ball, under Foul, a.
18. n. In various games or sports, an act done contrary to the rules; a foul stroke, hit, play, or the like.

WordNet 3.0

1. adj. disgustingly dirty; filled or smeared with offensive matter
2. adj. (of a manuscript) defaced with changes
3. v. hit a foul ball
4. v. commit a foul; break the rules
5. adj. offensively malodorous
6. adj. especially of a ship's lines etc
7. adj. highly offensive; arousing aversion or disgust
8. n. an act that violates the rules of a sport
9. adj. characterized by obscenity
10. adj. (of a baseball) not hit between the foul lines
11. v. make unclean
12. v. become soiled and dirty
13. v. become or cause to become obstructed
14. adj. violating accepted standards or rules
15. v. spot, stain, or pollute
16. v. make impure