1. adj. Covered with, or containing unclean matter; dirty.
This cloth is too foul to use as a duster.
His foul hands got dirt all over the kitchen.
The air was so foul nobody could breathe.
A ship's bottom is foul when overgrown with barnacles
A well is foul with polluted water.
2. adj. (i, of words or a way of speaking) obscene, vulgar or abusive.
The rascal spewed forth a series of foul words.
His foul language causes many people to believe he is uneducated.
3. adj. Detestable, unpleasant, loathsome.
He has a foul set of friends.
4. adj. Disgusting, repulsive; causing disgust.
This foul food is making me retch.
There was a foul smell coming from the toilet.
5. adj. (obsolete) Ugly; homely; poor.
6. adj. (i, of the weather) Unpleasant, stormy or rainy.
Some foul weather is brewing.
7. adj. Dishonest or not conforming to the established rules and customs of a game, conflict, test, etc.
Foul play is not suspected.
8. adj. (nautical) Entangled and therefore restricting free movement, not clear.
We've got a foul anchor.
a rope could get foul while paying it out.
9. adj. (baseball) Outside of the base lines; in foul territory.
Jones hit foul ball after foul ball.
10. v. To make dirty.
to foul the face or hands with mire
She's fouled her diaper.
11. v. To besmirch.
He's fouled his reputation.
12. v. To clog or obstruct.
The hair has fouled the drain.
13. v. (transitive, nautical) To entangle.
The kelp has fouled the prop.
14. v. (transitive, basketball) To make contact with an opposing player in order to gain advantage.
Smith fouled him hard.
15. v. (transitive, baseball) To hit outside of the baselines.
Jones fouled the ball off the facing of the upper deck.
16. v. (intransitive) To become clogged.
The drain fouled.
17. v. (intransitive) To become entangled.
The prop fouled on the kelp.
18. v. (intransitive, basketball) To commit a foul.
Smith fouled within the first minute of the quarter.
19. v. (intransitive, baseball) To hit a ball outside of the baselines.
Jones fouled for strike one.
20. subst. (sports) A breach of the rules of a game, especially one involving inappropriate contact with an opposing player in order to gain an advantage; for example, tripping someone up in soccer, or contact o
21. subst. (bowling) A (usually accidental) contact between a bowler and the lane before the bowler has released the ball.
22. subst. (baseball) A foul ball, a ball which has been hit outside of the base lines.