foul

Become or cause to become obstructed.

Become soiled and dirty.

Commit a foul; break the rules.

Hit a foul ball.

Make unclean.

“foul the water”

Make impure.

Spot, stain, or pollute.

Characterized by obscenity.

“foul language”

(of a baseball) not hit between the foul lines.

(of a manuscript) defaced with changes.

“foul (or dirty) copy”

Violating accepted standards or rules.

“used foul means to gain power”

Offensively malodorous.

“a foul odor”

Disgustingly dirty; filled or smeared with offensive matter.

“a foul pond”

Especially of a ship's lines etc.

“with its sails afoul”

“a foul anchor”

Highly offensive; arousing aversion or disgust.

An act that violates the rules of a sport.