filthy /ˈfɪlθi/adjective 4verb 2forms 5phrases 2 adjective4 •so dirty that people do not want to look at it or touch itThe 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 •(disapproving) Obscene or offensive.Filthy smirking Pat Robertson has come in second in the Iowa Republican caucuses. — 1987 •Very unpleasant or disagreeable.Oh, that filthy dream again. Nightmares are bad enough but when it comes to night-toads—! — 1934 •(Australia, slang) Angry; upset; severely annoyed.Terrific fun it was. My best mate saved me, and the teacher was filthy. — 1995 verb2 •To make very dirty; to saturate something with dirt. •To cover in filth.He shouldered his way inside, filthying his T-shirt on the charred wood. — 2009 formsfilthied · filthying · filthies · filthier · filthiest Phrases with filthy filthy lucreMoney, especially if obtained dishonestly. filthy richVery rich (wealthy).