Etymologically

Etymology and origin of the Latin word reprobus

Confidence
Established
Formation
Back-formation
First attested
c. 160–220 Tertullian More words from the 2nd century
Ultimate origin
Latin reprobō
Etymology tree
inherited borrowed derived
Latin probus
Latin probō
French prouver
Italian provare
Spanish probar
Dutch proberen
Hungarian próbál
Latin reprobō
Spanish reprobar
Latin reprobus
From the same root
Latin improbus ← probus
Latin probē ← probus
Latin probitās ← probus
French preuve ← probō
Latin approbō ← probō
Latin comprobō ← probō
Latin proba ← probō
Latin probābilis ← probō
Latin probātiō ← probō
Latin probātor ← probō
Latin probātus ← probō
French éprouver ← prouver
Italian prova ← provare
Spanish prueba ← probar

Pronunciation

  • Classical: [ˈrɛ.prɔ.bʊs][1]
  • Ecclesiastical: [ˈrɛː.pro.bus][1]

Forms

reprobus (feminine reproba, neuter reprobum); first/second-declension adjective[1]

Etymology

It is a back-formation from Latin reprobō (“to reject, condemn”), made by taking the adjectival ending ⟨-us⟩ in place of the verb's ending.[2][3][1] The TLL describes it as formed from the verb backwards, with no comparative or superlative attested.[3]

Earliest recorded meaning

The TLL finds it from Tertullian and Ulpian on.[3] Tertullian uses the masculine plural as a noun for the damned,[4] and Ulpian speaks of reproba pecunia, money rejected as below standard.[2][5][4]

Semantic evolution

The first sense was commercial: coins or money refused because they were base or false.[2][6] The word then spread mainly through the Bible and Church writers,[3] where it renders Ancient Greek ἀδόκιμος (adókimos): the Vulgate has argentum reprobum “rejected silver” and men reprobi circa fidem “worthless as to the faith”.[7][5] Ecclesiastical Latin used it for what is false, blameworthy or good for nothing, and as a noun for a castaway.[8]

Medieval Latin kept both lines: worthless, waste goods, and the reprobate, damned soul.[9] British sources apply it to things below standard, to base money, and to persons judged unfit for an office.[10]

Timeline

  • c. 160–220 AD – Tertullian uses reprobi for the damned.[4][3][11]
  • before 223 AD – Ulpian, in the Digest, writes of reproba pecunia, money refused as base.[2][5][11]
  • 390–406 AD – The Vulgate uses it of rejected silver and of men worthless in faith.[7][5][11]
  • c. 1090 – Anselm sets a consilium reprobum against God's eternal counsel.[10]

Meanings

Adjective

  1. (of money) Rejected as below standard; base, counterfeit.[2][5][6]
  2. (Late Latin) Spurious, worthless, reprehensible.[5][8][7]
  3. (Ecclesiastical Latin) Rejected by God, reprobate, damned; as a noun, a castaway.[4][8][9]
  4. (Medieval Latin) Below standard, unfit, especially of a person rejected for an office.[10][9]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  5. ^ a b c d e f Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ a b c Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  8. ^ a b c Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
  9. ^ a b c Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  10. ^ a b c Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  11. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Cite this entry

“Reprobus.” Etymologically, 8 Nov. 2026, etymologically.com/la/reprobus. Accessed 8 Nov. 2026.

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