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Alternative forms[edit]


From Middle English douteles, dowteles, equivalent to doubt +‎ -less.


  • IPA(key): /ˈdaʊ̯tləs/
  • (Canada) IPA(key): /ˈdʌʊ̯tləs/
  • (file)


doubtless (not comparable)

  1. Characterized by or experiencing no doubt at all, certain; undoubted; undoubting.
    • 1880, B. Stewart, P. G. Tait, The Unseen Universe, London: Macmillan, page xiii:
      There are those who have doubtless faith in revelation.
    • 1927, Edgar Rice Burroughs, chapter 7, in The Outlaw of Torn:
      It is doubtless that the old reprobate who sued for his daughter's hand heard some unsavory truths from the man.
  2. (obsolete) Free from fear or suspicion.

Derived terms[edit]



doubtless (not comparable)

  1. Without doubt; certainly; definitely; very probably, in all likelihood; doubtlessly.
    Synonyms: indubitably, undoubtably, undoubtedly, unquestionably, without a doubt, without doubt, indisputably, see also probably § Synonyms
    • 1850, [Alfred, Lord Tennyson], In Memoriam, London: Edward Moxon, [], →OCLC, Canto XXXIX, page 61:
      [] And, doubtless, unto thee is given
      ⁠A life that bears immortal fruit
      ⁠In such great offices as suit
      The full-grown energies of heaven.
    • 1893, Ambrose Bierce, The Realm Of The Unreal:
      I cannot remember that I spoke a word, though doubtless I did.
    • 1900 May 17, L[yman] Frank Baum, “The Council with The Munchkins”, in The Wonderful Wizard of Oz, Chicago, Ill., New York, N.Y.: Geo[rge] M. Hill Co., →OCLC, page 21:
      The men, Dorothy thought, were about as old as Uncle Henry, for two of them had beards. But the little woman was doubtless much older: her face was covered with wrinkles, her hair was nearly white, and she walked rather stiffly.
    • 1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 9:
      There is also in these matters of Science (though many scientific men would doubtless deny this) a great deal of "Fashion".
    • 2017 June 26, Alexis Petridis, “Glastonbury 2017 verdict: Radiohead, Foo Fighters, Lorde, Stormzy and more”, in Katharine Viner, editor, The Guardian[1], London: Guardian News & Media, →ISSN, →OCLC, archived from the original on 2017-06-26:
      Thom Yorke’s onstage pronouncements became less abstract and more effusive, they played the songs the less committed audience members doubtless wanted to hear in the first place: Paranoid Android, Creep, Fake Plastic Trees and Karma Police. At the end of the latter, Yorke happily led an audience singalong.

Derived terms[edit]



  • doubtless”, in OneLook Dictionary Search.