adjective, filth·i·er, filth·i·est.

  1. foul with, characterized by, or having the nature of filth; disgustingly or completely dirty.
  2. vile; vulgar; obscene: filthy language.
  3. contemptibly offensive, vile, or objectionable: to treat one’s friends in a filthy manner.
  4. (of money) abundantly supplied (often followed by with): They’re filthy with money.

verb (used with object), filth·ied, filth·y·ing.

  1. to make filthy; foul.
  1. filthy rich, outrageously wealthy; very rich.

adjective filthier or filthiest

  1. characterized by or full of filth; very dirty or obscene
  2. offensive or viciousthat was a filthy trick to play
  3. informal, mainly British extremely unpleasantfilthy weather


  1. extremely; disgustinglyfilthy rich

late 12c., fulthe, “corrupt, sinful,” from filth + -y (2). Meaning “physically unclean” is from late 14c. Meaning “morally dirty, obscene” is from 1530s.

In early use often hardly more emphatic than the mod. dirty; it is now a violent expression of disgust, seldom employed in polite colloquial speech. [OED]

Related: Filthiness.

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