Etymology From Middle English filthy, filthi, equivalent to filth + -y.
1
Covered with filth; very dirty.
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.1953 July, Allen Rowley, “First Impressions of American Railways”, in Railway Magazine, page 492:
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.
Oh, that filthy dream again. Nightmares are bad enough but when it comes to night-toads—!1934, Ernest Bramah, The Bravo of London:
Etymology From Middle English filthy, filthi, equivalent to filth + -y.
1
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
To cover in filth.
He shouldered his way inside, filthying his T-shirt on the charred wood.2009, Jeffery Deaver, Hell's Kitchen: