filthy

UK: /ˈfɪlθi/ US: /ˈfɪlθi/ ,(fil′thē)

Inflections of 'filthy' (adv):

filthier

adv comparative

filthiest

adv superlative

Inflections of 'filthy' (adj):

filthier

adj comparative

filthiest

adj superlative

Inflections of 'filthy' (v): (⇒ conjugate)

filthies

v 3rd person singular

filthying

v pres p

filthied

v past

filthied

v past p

WordReference Random House Learner's Dictionary of American English © 2025

filth•y /ˈfɪlθi/   adj., -i•er, -i•est. 

1. very dirty:
   The streets were filthy.
2. morally impure, obscene, or vulgar:
   filthy language.

Idioms

3. filthy rich, extremely rich.

filth•i•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

filth•y  (fil′thē), adj., filth•i•er, filth•i•est, adv., v., filth•ied, filth•y•ing. 
adj. 

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

adv. 

5. (of money or wealth) very;
   extremely:
   They say he's filthy rich.

v.t. 

6. to make filthy;
   foul.

• 1350–1400; Middle English; see filth, -y¹

filth′i•ly, adv. 
filth′i•ness, n. 
Synonyms

• 1. See dirty. 

Collins Concise English Dictionary © HarperCollins Publishers::

filthy / ˈfɪlθɪ/ adjective (filthier, filthiest)

1. characterized by or full of filth; very dirty or obscene
2. offensive or vicious: that was a filthy trick to play
3. extremely unpleasant: filthy weather

adverb

1. extremely; disgustingly: filthy rich

ˈfilthily adverb

ˈfilthiness noun