Indecorous is a related term of filthy.
As adjectives the difference between indecorous and filthy
is that indecorous is improper, immodest or indecent while filthy is covered with filth; very dirty.
filthy
Adjective
(er)
Covered with filth; very dirty.
Obscene or offensive.
Very unpleasant or disagreeable.
Antonyms
* (covered with filth ): pristine
* (obscene ): holy, venerable
Synonyms
* (covered with filth ): sleazy, slimy, grimy
* (obscene ): gruesome
Derived terms
* filthy rich
* filthily
Quotations
* (obscene'') 1987:''' “'''Filthy smirking Pat Robertson has come in second in the Iowa Republican caucuses.” -''Final Diary , Michael Grumley