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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. 2017.
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Examples from the Web for doubtlessly
Contemporary Examples
Historical Examples
  • Unfortunately for me, doubtlessly, that is so subtile, that I do not understand it.

    The Prairie Flower Gustave Aimard
  • Some of us must doubtlessly perish spiritually in such investigations.

    The Way of All Flesh Samuel Butler
  • doubtlessly the Christmas spirit got into Betty Gwins typewriter keys.

    Local Color Irvin S. Cobb
  • And which 'four' does the clergyman accept as doubtlessly "genuine?"

  • doubtlessly she had been holding clandestine meetings ever since.

    The Threatening Eye Edward Frederick Knight
  • Awdrey, inert as he doubtlessly was, seemed to feel her gaze—he looked at her.

  • doubtlessly he was not over-anxious to introduce the son of his King into the secret retreat.

    The Poniard's Hilt Eugne Sue
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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