Etymologically

Etymology and origin of the Proto-West Germanic word *fūliþu

Confidence
Established
Formation
Inherited
Inherited from
Proto-Germanic *fūliþō
Etymology tree
inherited borrowed derived
Proto-West Germanic *fūliþu
English filth
From the same root
English filthy ← filth

Reconstruction

Ringe and Taylor reconstruct *fūliþu "rottenness" for Proto-West Germanic,[1] and Wiktionary has the same form.[2]

Etymology

It is inherited from Proto-Germanic *fūliþō (“rottenness”), the Proto-Germanic noun as Köbler and Fulk reconstruct it;[3][4] Köbler also gives the variant *fūleþō and refers the noun to the adjective *fūlā-.[3]

Morphology

A feminine ō-stem.[5][6] EWA refers Old High German fūlida to the suffix -ida.[6] Old High German also has a masculine n-stem fūlido beside it, recorded in the Tatian.[7]

Evidence

Ringe and Taylor cite Old Saxon fūlitha and Old High German fūlida for the Proto-West Germanic noun, and trace Old English fȳlþ to it through *fȳliþu, with *ū fronted to *ȳ.[1] Fulk gives the Old English word, Kentish fēlþ, as an example of this change of ū to ȳ (Kentish ē), and compares the adjective fūl (“foul”).[4] In Old Dutch, Old Dutch fūlitha glosses Latin putrēdō in the Old Low and Middle Franconian psalms and glosses of the 10th century.[8] Old Saxon has the word in a gloss of the end of the 10th century, also for putrēdō.[5]

Competing analyses

Wiktionary takes the noun for a West Germanic formation from *fūl (“foul, dirty”) with the abstract suffix *-iþu,[2] while Köbler and Fulk already set it up for Proto-Germanic.[3][4]

Meanings

  1. rottenness[1][2]
  2. foulness, filth[2][9]

Old High German also used the word for "stench" and "depravity".[6]

Reflexes

  • Old English: fȳlþ (“dirt, uncleanness”)[10]
  • Old Saxon: fūlitha (“decay, rotten place”)[5]
  • Old Dutch: fūlitha (“rotting”)[8]
  • Old High German: fūlida (“rottenness, stench, depravity”)[6]

References

  1. ^ a b c Ringe, Don; Taylor, Ann (2014), The Development of Old English, A Linguistic History of English II, Oxford: Oxford University Press, p. 224
  2. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org, p. s.v. *fūliþu
  3. ^ a b c Köbler, Gerhard (2014), Germanisches Wörterbuch, 5th ed., online, koeblergerhard.de/wikiling, p. s.v. *fūliþō
  4. ^ a b c Fulk, R. D. (2018), A Comparative Grammar of the Early Germanic Languages, Studies in Germanic Linguistics 3, Amsterdam / Philadelphia: John Benjamins
  5. ^ a b c Köbler, Gerhard (2014), Altsächsisches Wörterbuch, 5th ed., online, koeblergerhard.de/wikiling, p. s.v. fūlitha
  6. ^ a b c d Lloyd, Albert L.; Springer, Otto; Lühr, Rosemarie, et al. (1988–), Etymologisches Wörterbuch des Althochdeutschen, Göttingen: Vandenhoeck & Ruprecht; online ewa.saw-leipzig.de, p. s.v. fûlida
  7. ^ Köbler, Gerhard (2014), Althochdeutsches Wörterbuch, 6th ed., online, koeblergerhard.de/wikiling, p. s.v. fūlido
  8. ^ a b Oudnederlands Woordenboek (2009–), Instituut voor de Nederlandse Taal, Leiden; gtb.ivdnt.org, p. s.v. fūlitha
  9. ^ Köbler, Gerhard, Altniederfränkisches Wörterbuch, online, koeblergerhard.de/wikiling, p. s.v. fūlitha
  10. ^ Köbler, Gerhard (2014), Altenglisches Wörterbuch, 4th ed., online, koeblergerhard.de/wikiling, p. s.v. fȳlþ

Related etymologies

  • *stain · also from Proto-Germanic
  • *beran · also from Proto-Germanic
  • *sōkijan · also from Proto-Germanic
  • *fimf · also from Proto-Germanic
  • *hail · also from Proto-Germanic
  • *hertā · also from Proto-Germanic
  • *busk · also from Proto-Germanic
  • *reht · also from Proto-Germanic
Cite this entry

“*fūliþu.” Etymologically, 16 Nov. 2026, etymologically.com/gmw-pro/*f%C5%ABli%C3%BEu. Accessed 16 Nov. 2026.

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