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doubtless

[dout-lis] /ˈdaʊt lɪs/
adverb, Also, doubtlessly
1.
without doubt; certainly; surely; unquestionably.
2.
probably or presumably.
adjective
3.
free from doubt or uncertainty; certain, sure.
Origin of doubtless
1300-1350
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.
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for doubtless
Contemporary Examples
Historical Examples
  • These losses are doubtless irreparable so far as the stocks in question are concerned.

    The Spenders Harry Leon Wilson
  • The husband in my case was to be an inconvenience, but doubtless an amusing one.

    The Spenders Harry Leon Wilson
  • If he carried her triumphantly off, doubtless his regret for that would eventually be as great.

    The Spenders Harry Leon Wilson
  • We could not find any of his camps, however; doubtless the sand has long since covered them.

  • So this part of my restraint was doubtless a stretch of the authority given him.

    Clarissa, Volume 1 (of 9) Samuel Richardson
British Dictionary definitions for doubtless

doubtless

/ˈdaʊtlɪs/
adverb (sentence substitute or sentence modifier)
1.
certainly
2.
probably
adjective
3.
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 doubtless

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

Online Etymology Dictionary, © 2010 Douglas Harper
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