Where does “filthy” come from?

Filthy comes from Middle English filthy, from Old English fylþig, meaning "full of filth or unclean," derived from the noun filth.

filthy (English): Covered with filth; very dirty; Obscene or...

Definitions

  1. Covered with filth; very dirty; Obscene or...

Ancestry of “filthy”, step by step

filthy traces back through two separate lines of ancestry.

via English filth

StepLanguageWordMeaning
1EnglishfilthDirt; foul matter; that which soils or defiles;...
2Middle Englishfilth—
3Old Englishfȳlþufilth
4Proto-West Germanicfūliþufoulness, rottenness, filth
5Proto-West Germanicfūlfoul, dirty
6Proto-Germanicfūlazfoul, dirty; rotten
7Proto-Indo-Europeanpū-rotten, putrid; be rotten; putrid; to rot, swell,...

via Middle English filthy

StepLanguageWordMeaning
1Middle Englishfilthy—

Words derived from “filthy”

Every word from Proto-Indo-European pū- →Every word from Proto-Germanic fūlaz →Every word from Proto-West Germanic fūl →