Etymologically

Etymology and origin of the Latin word dubiosus

Confidence
Established
Formation
Derivation
First attested
c. 165 AD, Aulus Gellius
Ultimate origin
Latin dubius
Etymology tree
inherited borrowed derived
Latin dubius
Italian dubbio
Latin dubiosus
From the same root
Latin dubie ← dubius

Pronunciation

  • Classical: [dʊ.biˈoː.sʊs][1]
  • Ecclesiastical: [du.biˈɔː.s̬us][1]

Forms

dubiōsus (feminine dubiōsa, neuter dubiōsum); first/second-declension adjective[1]

Etymology

It is from Latin dubius (“doubtful”) + -ōsus.[2][1][3] The TLL derives it from the noun dubium (“doubt”).[4]

Earliest recorded meaning

Aulus Gellius is its first author.[3][5] In the Attic Nights he says that Varro set apart twenty-one comedies of Plautus because they were not doubtful (quoniam dubiosae non erant),[4][6] and elsewhere that the judges thought a point doubtful and impossible to resolve.[4][7]

Semantic evolution

Lewis & Short call it post-classical;[5] the classical word was dubius.[8] In Medieval Latin it could mean “doubting, unbelieving”: Burchard of Worms says that the devil was deceitful and doubting from the beginning.[9] Du Cange records it for “dangerous” in dubiosum mare, in statutes of the fishermen of Marseille,[10] and for “doubtful” in a sermon that calls the rule of Basil rather doubtful.[10] Hungarian sources use it for rights in doubt, for a book of doubtful authority, and for a forgotten debt.[11] English took dubious from it in the 1540s,[12] and it is the source of Italian dubbioso.[7]

Timeline

  • c. 165 AD – Aulus Gellius uses it of comedies of doubtful authorship.[4][3]
  • 1435 – A Hungarian decree speaks of rights fallen in and doubtful.[11]
  • 1461 – A verse in an English register uses it.[13]
  • 1540s – English dubious is recorded.[12]

Meanings

Adjective

  1. Open to doubt, doubtful, uncertain.[2][5][8][14]
  2. (Medieval Latin) Doubting, unbelieving.[9][3]
  3. (Medieval Latin) Dangerous, perilous.[10]
  4. (Medieval Latin) Of doubtful authority, apocryphal; forgotten.[11]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ a b c d Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ VoLat: Vocabolario della Lingua Latina (2018), Milan: Hoepli
  7. ^ a b Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  8. ^ a b Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  9. ^ a b Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  10. ^ a b c du Cange, Charles du Fresne, et al. (1883–1887), Glossarium mediae et infimae latinitatis, augmented ed. by Léopold Favre, Niort: L. Favre
  11. ^ a b c Bartal, Antal, et al. (1987–), Lexicon Latinitatis Medii Aevi Hungariae, Budapest: Akadémiai Kiadó; online ed. ELTE
  12. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  13. ^ 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
  14. ^ Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
Cite this entry

“Dubiosus.” Etymologically, 24 Oct. 2026, etymologically.com/la/dubiosus. Accessed 24 Oct. 2026.

Last edited on . ·