filthy

Etymology

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

adj

1. Covered with filth; very dirty.
2. Obscene or offensive.
   Filthy smirking Pat Robertson has come in second in the Iowa Republican caucuses. 1987, Michael Grumley, Final Diary
3. Very unpleasant or disagreeable.

verb

1. (transitive) To make very dirty; to saturate something with dirt.
   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. 2007, Tom Bissell, Chasing the Sea: Lost Among the Ghosts of Empire in Central Asia
2. (transitive) To cover in filth.
   He shouldered his way inside, filthying his T-shirt on the charred wood. 2009, Jeffery Deaver, Hell's Kitchen