doubtless

• doubtlesse, doutless (obsolete)

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

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

• Audio (US):

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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.
   • c. 1596 (date written), William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies  (First Folio), London: Isaac Iaggard, and Ed Blount, published 1623, →OCLC, :

     Pretty child, sleep doubtless and secure.

• doubtlessness

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[elvin] 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, 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.

• doubtlessly

• “doubtless”, in OneLook Dictionary Search.