Foul
/faʊl/
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.”