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filthy

[fil-thee]
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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.
Idioms
  1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for filthy rich

filthy

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
adverb
  1. 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 rich

filthy

adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper