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See more synonyms for doubtless on Thesaurus.com
adverb Also doubt·less·ly.
  1. without doubt; certainly; surely; unquestionably.
  2. probably or presumably.
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  1. free from doubt or uncertainty; certain, sure.
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Origin of doubtless

First recorded in 1300–50, doubtless is from the Middle English word douteles. See doubt, -less
Related formsdoubt·less·ness, 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


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


adverb Also: doubtlessly (sentence substitute or sentence modifier)
  1. certainly
  2. probably
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  1. certain; assured
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Derived Formsdoubtlessness, 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

Word Origin and History for doubtless

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

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Online Etymology Dictionary, © 2010 Douglas Harper