foul with, characterized by, or having the nature of filth; disgustingly or completely dirty.

vile; vulgar; obscene

filthy language.

contemptibly offensive, vile, or objectionable

to treat one's friends in a filthy manner.

(of money) abundantly supplied (often fol. by with )

They're filthy with money.

to make filthy; foul. ?

filthy rich

outrageously wealthy; very rich.

noun

filth , foulness , griminess , grubbiness , smuttiness , squalor , uncleanliness , uncleanness , bawdiness , coarseness , dirtiness , grossness , lewdness , profaneness , profanity , scurrility , scurrilousness , vulgarity , vulgarness