Etymologically

Etymology and origin of the Old Norse word fastr

Confidence
Established
Formation
Inherited
First attested
1200 Icelandic Homily Book More words from the 12th century
Inherited from
Proto-Germanic *fastuz
Ultimate origin
Proto-Germanic *fastuz

Forms

fastr adj (feminine fǫst, neuter fast)[1][2]

Etymology

It is inherited from Proto-Germanic *fastuz (“firm, solid”),[3][4] originally a u-stem adjective, which West Germanic remodelled as a ja-stem.[4][5] Its cognates are Old English fæst, Old Frisian fest, Old Saxon fast and Old High German festi.[4][6] The same stem underlies the verb fasta (“to fast”) and its counterpart Gothic 𐍆𐌰𐍃𐍄𐌰𐌽 (fastan).[4][7]

Outside Germanic the one secure match is Old Armenian հաստ (hast, “firm”).[4][6] Kroonen sets up a root Proto-Indo-European *pHst-, which he explains as a compound of *peh₂ǵ- (“to become firm”), the root of Ancient Greek πήγνυμι (pḗgnumi, “to fasten, make solid”), and *steh₂- (“to stand”), and he gives up the old comparison with Sanskrit पस्त्य (pastyá, “homestead”),[4] which de Vries, Torp and Falk and Torp still make.[6][7][8] Pokorny's root is *pasto- (“firm”).[9] Ásgeir Blöndal Magnússon reviews these proposals and calls them all uncertain.[5]

Earliest recorded meaning

ONP's first dated records are from the Icelandic Homily Book of about 1200, where the neuter is already used as an adverb: réynom til. hve fast haɴ halldi vinóttoɴi viþ mic “let us try how firmly he holds to his friendship with me”.[10] In Menota it first appears in the manuscripts AM 619 4to and AM 677 4to of 1200–1225.[11][12] Larsson lists fastr, fastan and fast among the oldest Icelandic manuscripts.[13]

Semantic evolution

The basic sense is “fixed, immovable, stuck fast”, as in fastr á velli “standing firm in battle”.[10][14] From it come “bound, unfree”, used of a thrall tied to the land (fastr á fótum) and of a debtor held until he has worked off what he owes,[15][16] and “close-fisted”, first dated about 1225.[10][1] A promise or a truce that is fast is binding and valid, and Hertzberg gives the legal uses such as fast kaup “a binding bargain”.[1][16] The laws and charters contrast fast and lauss for real estate and movable goods, as in í fǫstu ok lausu.[10][15] In grammar a syllable ending in a double consonant is fast atkvæði.[14]

The word continues as Icelandic fastur and Faroese fastur.[5] In Swedish the adverb fast “very” is native, while the sense “almost” came from German,[17] and Falk and Torp say the same of Norwegian and Danish.[8]

Timeline

  • 1200 – hve fast “how firmly” in the Icelandic Homily Book.[10]
  • 1200–1225 – fastr and fast in the manuscripts AM 619 4to and AM 677 4to.[11][12]
  • 1212 – the sense “bound, unfree”.[10]
  • 1225 – the sense “close-fisted, sparing”.[10]
  • 1250 – the sense “valid, binding” in a text of the Icelandic laws.[10]

Meanings

Adjective

  1. fast, firm, immovable; stuck fast.[10][1]
  2. bound, unfree, of a thrall or a debtor.[15][16]
  3. close-fisted, sparing.[1][18]
  4. of a meeting: in session.[1][14]
  5. firm, faithful, binding, of a promise, truce or bargain.[1][16]
  6. continuous, of a stretch of days.[18]
  7. strong, hard, of a fight.[1]
  8. (law) of property: real, immovable, as opposed to movables.[10][15]
  9. (grammar) of a syllable: ending in a double consonant.[14]

Adverb

  1. neuter fast: firmly, tightly; hard, vigorously.[2][19]

Word family

  • fasta
  • fastna
  • festa
  • staðfastr
  • trúfastr
  • vinfastr
  • geðfastr
  • samfastr
  • áfastr
  • griðfastr
  • jafnfastr

Descendants

  • Icelandic fastur[3]
  • Faroese fastur[3]
  • Norwegian Nynorsk fast[3]
  • Swedish fast[3]
  • Danish fast[3]

Usage notes

As a personal name, Fastr and names with Fast- and -fastr appear in Swedish runic inscriptions.[20][6] De Vries counts names such as Fastbjǫrn, Fastólfr and Holmfastr as chiefly East Scandinavian.[6]

References

  1. ^ a b c d e f g h Zoëga, Geir T. (1910), A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press, p. s.v. fastr
  2. ^ a b Faulkes, Anthony (2011), A New Introduction to Old Norse III: Glossary and Index of Names, 4th ed., London: Viking Society for Northern Research, p. s.v. fastr
  3. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  4. ^ a b c d e f Kroonen, Guus (2013), Etymological Dictionary of Proto-Germanic, Leiden Indo-European Etymological Dictionary Series 11, Leiden / Boston: Brill, p. 131
  5. ^ a b c Ásgeir Blöndal Magnússon (1989), Íslensk orðsifjabók, Reykjavík: Orðabók Háskólans, ordsifjabok.arnastofnun.is, p. s.v. fastur
  6. ^ a b c d e de Vries, Jan (1977), Altnordisches etymologisches Wörterbuch, 2nd ed., Leiden: Brill, p. 113
  7. ^ a b Torp, Alf (1909), Wortschatz der germanischen Spracheinheit (Fick, Vergleichendes Wörterbuch der indogermanischen Sprachen, 4th ed., vol. 3), Göttingen, p. 239
  8. ^ a b Falk, Hjalmar; Torp, Alf (1910–1911), Norwegisch-dänisches etymologisches Wörterbuch, Heidelberg, p. s.v. fast
  9. ^ Köbler, Gerhard (2014), Germanisches Wörterbuch, 5th ed., online, koeblergerhard.de/wikiling, p. s.v. *fastuz
  10. ^ a b c d e f g h i j Ordbog over det norrøne prosasprog / A Dictionary of Old Norse Prose, Copenhagen, onp.ku.dk (CC BY-SA 4.0), p. s.v. fastr
  11. ^ a b Menota: Medieval Nordic Text Archive, menota.org (texts by shelfmark; CC BY-SA 4.0), p. AM 619 4to
  12. ^ a b Menota: Medieval Nordic Text Archive, menota.org (texts by shelfmark; CC BY-SA 4.0), p. AM 677 4to
  13. ^ Larsson, Ludvig (1891), Ordförrådet i de älsta islänska handskrifterna, Lund: Ph. Lindstedt, p. 85
  14. ^ a b c d Cleasby, Richard; Vigfússon, Guðbrandur (1874), An Icelandic-English Dictionary, Oxford: Clarendon Press, p. 145
  15. ^ a b c d Fritzner, Johan (1886–1896), Ordbog over det gamle norske Sprog, 2nd ed., Kristiania, p. s.v. fastr
  16. ^ a b c d Hertzberg, Ebbe (1895), Glossarium, in Norges gamle Love indtil 1387, vol. 5, Christiania, p. 179
  17. ^ Hellquist, Elof (1922), Svensk etymologisk ordbok, Lund, p. s.v. fast
  18. ^ a b Baetke, Walter (1965–1968), Wörterbuch zur altnordischen Prosaliteratur, Berlin (digital ed. Greifswald 2006), p. 129
  19. ^ Finnur Jónsson (1931), Lexicon Poeticum antiquæ linguæ septentrionalis, 2nd ed., Copenhagen: S. L. Møller, p. 124
  20. ^ Peterson, Lena (2007), Nordiskt runnamnslexikon, 5th ed., Uppsala: Institutet för språk och folkminnen, p. 62

Related etymologies

  • visk · also from Proto-Germanic
  • klubba · also from Proto-Germanic
  • hǫggva · also from Proto-Germanic
  • taka · also from Proto-Germanic
  • garðr · also from Proto-Germanic
  • geta · also from Proto-Germanic
  • draga · also from Proto-Germanic
  • flatr · also from Proto-Germanic
Cite this entry

“Fastr.” Etymologically, 14 Nov. 2026, etymologically.com/non/fastr. Accessed 14 Nov. 2026.

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