fouler
foul-er
noun
A person or thing that commits a foul, especially in sports.
"The referee warned the constant fouler."
adjective
More unpleasant, dirty, or unfair than something else.
"The air in the city was fouler."
Thesaurus
Synonyms: foul, tangled, fouled, afoul, out-of-bounds, nasty, dirty, unclean, filthy, soiled, clog, crap up