filthy

English Wikipedia has an article on:

filthy

Wikipedia

From Middle English filthy, filthi, equivalent to filth +‎ -y.

• IPA^(key): /ˈfɪlθi/

• Audio (US):

  (file)

filthy (comparative filthier, superlative filthiest)

1. Covered with filth; very dirty.
   • 1953 July, Allen Rowley, “First Impressions of American Railways”, in Railway Magazine, page 492:

     The coaches were filthy outside and did not appear to have been painted or washed for years. Inside there were uncomfortable seats covered with a cane-like material.

2. Obscene or offensive.
   • 1987, Michael Grumley, Final Diary:

     Filthy smirking Pat Robertson has come in second in the Iowa Republican caucuses.

3. Very unpleasant or disagreeable.

• (covered with filth): sleazy, slimy, grimy, horry
• (obscene): gruesome, smutty

• (covered with filth): pristine
• (obscene): holy, venerable

filthy (third-person singular simple present filthies, present participle filthying, simple past and past participle filthied)

1. (transitive) To make very dirty; to saturate something with dirt.
   • 2007, Tom Bissell, Chasing the Sea: Lost Among the Ghosts of Empire in Central Asia:

     In the years following World War Two, Americans cut down vast forests, built thousands of factories, assembled millions of atmospherically toxic automobiles, and filthied the water throughout North America.

2. (transitive) To cover in filth.
   • 2009, Jeffery Deaver, Hell's Kitchen:

     He shouldered his way inside, filthying his T-shirt on the charred wood.