[ fil-thee ]
/ ˈfɪl θi /

adjective, filth·i·er, filth·i·est.

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 followed by with): They're filthy with money.

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

to make filthy; foul.

Nearby words

  1. filter tip,
  2. filterable,
  3. filterable virus,
  4. filtering operation,
  5. filth,
  6. filthy lucre,
  7. filtrable,
  8. filtrate,
  9. filtration,
  10. filtration angle


    filthy rich, outrageously wealthy; very rich.

Origin of filthy

Middle English word dating back to 1350–1400; see origin at filth, -y1

Related formsfilth·i·ly, adverbfilth·i·ness, noun

Synonym study

1. See dirty. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for filthy

British Dictionary definitions for filthy


/ (ˈfɪlθɪ) /

adjective filthier or filthiest

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


extremely; disgustinglyfilthy rich
Derived Formsfilthily, adverbfilthiness, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for filthy


Online Etymology Dictionary, © 2010 Douglas Harper