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.


    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 filthiness

Contemporary Examples of filthiness

Historical Examples of filthiness

  • When shall I rest, and be cleansed from the filthiness which is gone forth out of me?

    Jesus the Christ

    James Edward Talmage

  • For century after century the idea prevailed that filthiness was akin to holiness.

  • But all love, of whatsoever sort, say they, is a filthiness of the flesh.

    In Convent Walls

    Emily Sarah Holt

  • I see dirt in mine own tears, and filthiness in the bottom of my prayers.

  • What is to be got rid of is not this or that defect or vice, but 'all filthiness of flesh and spirit.'

British Dictionary definitions for filthiness


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 filthiness



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