Filthier Synonyms and Antonyms

Heavily soiled; very dirty or unclean
(Adjective)
Antonyms:
  1. cleaner
  2. purer
So objectionable as to elicit despisal or deserve condemnation
(Adjective)
Vile; despicable
(Adjective)
Covered or smeared with filth; disgustingly dirty.
(Adjective)
Synonyms:
  1. dirtier