Etymologically
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dubious

This is the current revision of this entry, as edited by bogdan on 31 October 2026 at 11:33. This address is a permanent link to this version.
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Pronunciation

  • UK: /ˈd͡ʒuː.bi.əs/, /ˈdjuː.bi.əs/[1]
  • US: /ˈdu.bi.əs/[1]

Etymology

It is borrowed from Latin dubiōsus (“doubtful”),[2][3][4][5] from dubium (“doubt”), the neuter of dubius (“wavering, doubtful”),[2][6][4] from duo (“two”), with the sense of being undecided between two things.[6][3][4] Etymonline calls dubiōsus Late Latin,[6] and the American Heritage Dictionary, Merriam-Webster and Collins derive the English word from dubius itself.[7][8][9] Klein and Barnhart reconstruct dubius as Proto-Indo-European *du-bhw-iyos (“being double, of two natures”), formed from the stem of duo and Proto-Indo-European *bheu- (“to be”);[10][3] the root of duo is Proto-Indo-European *dwo- (“two”).[6][7] Weekley compares German Zweifel (“doubt”), from zwei (“two”), and Old English twēo (“doubt”),[11] and Etymonline notes that Old English used twēo for doubt.[6] The word is related to doubt, which came through French.[12][4]

Earliest recorded meaning

Causing doubt; uncertain, ambiguous, vague: 1548, in Hall's chronicle of the union of Lancaster and York.[2][3]

Semantic evolution

From 1632 it was also used of the person who doubts, wavering or hesitating in opinion,[2][6] the sense in which the Oxford Dictionary of English places its first use.[13] From 1635 it meant of uncertain outcome,[2] and Johnson (1755) gave both the doubting and the doubted senses.[14] The sense "of questionable character, suspect" is recorded from 1860, in Tyndall's Glaciers of the Alps.[2] In Leicestershire and Shropshire dialect it was pronounced dubous or jubous, meaning undecided.[15]

Timeline

  • 1548 – occasioning doubt; uncertain, ambiguous.[2][3]
  • 1632 – of a person, wavering, hesitating in opinion.[2]
  • 1635 – of uncertain outcome.[2]
  • 1860 – of questionable or suspected character.[2]

Meanings

Adjective

  1. Unsure or doubtful about something; hesitating: She was dubious about the new schedule.[8][9][2]
  2. Of questionable quality, honesty or worth; suspect: a man with a dubious past.[9][8][2]
  3. Giving rise to doubt; ambiguous or unclear.[8][9][2]
  4. Of uncertain outcome.[2][8][9]

Word family

  • dubiously
  • dubiousness
  • superdubious
  • undubious

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  4. ^ a b c d Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  5. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  6. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  7. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  8. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  9. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins
  10. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  11. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
  12. ^ Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
  13. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  14. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
  15. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)