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[dout-lis] /ˈdaʊt lɪs/
adverb, Also, doubtlessly
without doubt; certainly; surely; unquestionably.
probably or presumably.
free from doubt or uncertainty; certain, sure.
Origin of doubtless
First recorded in 1300-50, doubtless is from the Middle English word douteles. See doubt, -less
Related forms
doubtlessness, noun
Synonym Study
1, 2. Doubtless, undoubtedly, indubitably, unquestionably are adverbs that express certainty. Doubtless, although it sometimes denotes an absolute degree of certainty, more often means “probably,” “presumably,” or “no doubt”: She will doubtless accept the offer. Undoubtedly means “beyond doubt”: undoubtedly the most prolific and popular composer of his time. Indubitably and unquestionably both affirm an unassailable conviction; they differ only in tone, indubitably being appropriate to more formal or learned discourse and unquestionably appropriate in a wider range of contexts and styles: an indubitably (or unquestionably) accurate transliteration of the hieroglyphic text; unquestionably the hottest running back in the league. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for doubtlessly
Contemporary Examples
Historical Examples
  • Some of us must doubtlessly perish spiritually in such investigations.

    The Way of All Flesh Samuel Butler
  • Lorenzo slain, too, and doubtlessly also by the impetuous Viscount's hand!

  • This also must doubtlessly be rejected, as Haberlandt has observed.

    At the Deathbed of Darwinism Eberhard Dennert
  • Besides, consciously or unconsciously, you have doubtlessly encouraged Wilson.

    The Day of Judgment

    Joseph Hocking
  • They doubtlessly intended to camp for a portion of the night at this spot.

    The Trail-Hunter Gustave Aimard
  • doubtlessly she had been holding clandestine meetings ever since.

    The Threatening Eye Edward Frederick Knight
  • The Indians, doubtlessly, fancied me dead, and left me where I lay.

    The Prairie Flower Gustave Aimard
British Dictionary definitions for doubtlessly


adverb (sentence substitute or sentence modifier)
certain; assured
Derived Forms
doubtlessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for doubtlessly


mid-14c. (adv.), mid-15c. (adj.), from doubt (n.) + -less. Related: Doubtlessly.

Online Etymology Dictionary, © 2010 Douglas Harper
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