foul

adjective

• Covered with, or containing unclean matter; dirty.

  "A ship's bottom is foul when overgrown with barnacles"

• (of words or a way of speaking) obscene, vulgar or abusive.

  "His foul language causes many people to believe he is uneducated."

• Detestable, unpleasant, loathsome.

  "He has a foul set of friends."

• Disgusting, repulsive; causing disgust.

  "There was a foul smell coming from the toilet."

• Ugly; homely; poor.
• (of the weather) Unpleasant, stormy or rainy.

  "Some foul weather is brewing."

• Dishonest or not conforming to the established rules and customs of a game, conflict, test, etc.

  "Foul play is not suspected."

• Entangled and therefore restricting free movement, not clear.

  "We've got a foul anchor."

• Outside of the base lines; in foul territory.

  "Jones hit foul ball after foul ball."