Synonyms for filthy include: dirty, grimy, messy, sloppy, stinky, nasty, and soiled.
filthy air = pollution or smog
sty
Dirty grubby filthy
dirty, grimy, filthy, sandy, grubby
The bathroom stalls were filthy. The words that they said were filthy. "Your room looks filthy," said Mom.
The noun form of the adjective 'filthy' is filthiness.The word 'filthy' is the adjective form of the noun filth.
A false idol, or if you worship toilets, then it's your filthy, gurgling, clogging god.
squalor
salach
half-baked, underdone rare, uncooked.uncooked, unrefined
Indeed, the word filthy is an adjective, as it describes something associated with the noun "filth".
filthy