Proto-Germanic: *faujan- vb., *fūwan-, *faujan-, *fūla-, *fauska-, *fáusa-, *fauzá-; *fauziōn, *fūkēn, *fūnī(n), *fūjēn
Meaning: rot, rotten, pus
Gothic: ful-s `decomposed, foul'
Old Norse: fūin-n `verfault, rott', fūi m. `Fäulnis', fūna wk. `verwesen, verfaulen', feyja wk. `verfaulen lassen'; fūl-l `faul, stinkend'; fausk-r m. `vermodertes Holz', fauski m. `id'; feyra f. `inneres, poröses Zellgewebe im Knochen'; fūki m. `Gestank', NIsl fūki `id.; fauler Seetang'
Norwegian: dial. föyr `schwammartig'; dial. föyra `Zellgewebe'; fūl `ranzig, geil, böse'; fausk
Swedish: ful `faul'; dial. fausk, fösk `morsches Holz'
Danish: ful `hässlich'
Old English: fūl `faul'; fyne `Feuchtigkeit, Morast', fynig `feucht'
English: foul; finew
Old Frisian: fūlnisse `rotting, vuiligheid'
Old Saxon: fūl `faul', fūlitha `rotting'
Middle Dutch: vuul; voos `schwammig'; voosch
Dutch: vuil; voos `schwammig', vuns
Old Franconian: fūlitha `rotting, vuiligheid'
Middle Low German: vūl
Old High German: fūl (9.Jh.) `faul'
Middle High German: vūl, voul adj. 'morsch, faul, verfault; gebrechlich, schwach'
German: faul; { schweiz. gefosen `morschgeworden' }
