"fouler" in the adjective sense
1. disgusting, disgustful, distasteful, foul, loathly, loathsome, repellent, repellant, repelling, revolting, skanky, wicked, yucky
highly offensive arousing aversion or disgust
"a disgusting smell"
"distasteful language"
"a loathsome disease"
"the idea of eating meat is repellent to me"
"revolting food"
"a wicked stench"
2. fetid, foetid, foul, foul-smelling, funky, noisome, smelly, stinking, ill-scented
offensively malodorous
"a foul odor"
"the kitchen smelled really funky"
3. cheating, dirty, foul, unsporting, unsportsmanlike
violating accepted standards or rules
"a dirty fighter"
"used foul means to gain power"
"a nasty unsporting serve"
"fined for unsportsmanlike behavior"
4. foul
of a baseball) not hit between the foul lines
5. dirty, foul, marked-up
of a manuscript) defaced with changes
"foul (or dirty) copy"
6. cruddy, filthy, foul, nasty, smutty
characterized by obscenity
"had a filthy mouth"
"foul language"
"smutty jokes"
7. filthy, foul, nasty
disgustingly dirty filled or smeared with offensive matter
"as filthy as a pigsty"
"a foul pond"
"a nasty pigsty of a room"
8. afoul, foul, fouled
especially of a ship's lines etc
"with its sails afoul"
"a foul anchor"
Source: WordNet® (An amazing lexical database of English)
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