- without doubt; certainly; surely; unquestionably.
- probably or presumably.
- free from doubt or uncertainty; certain, sure.
Origin of doubtless
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
Examples from the Web for doubtlessly
In "Pamela 1" Louie wades deeper into the gender pool, doubtlessly inviting a tidal wave of backlash.Louie Attempts Rape (and Explores the ‘Nice Guy’ Phenomenon)
June 3, 2014
They doubtlessly wish they had gone to Ohio or Florida instead of the land of small roads and small houses.The Ugly American: Mitt Romney’s Disastrous Overseas Excursion
July 31, 2012
Unfortunately for the people of Afghanistan, the future will doubtlessly hold may more months, if not years, of hard fighting.Obama’s Afghan Pullout
Sami Yousafzai, Ron Moreau
June 23, 2011
Some of us must doubtlessly perish spiritually in such investigations.The Way of All Flesh
Lorenzo slain, too, and doubtlessly also by the impetuous Viscount's hand!Monte-Cristo's Daughter
This also must doubtlessly be rejected, as Haberlandt has observed.At the Deathbed of Darwinism
Besides, consciously or unconsciously, you have doubtlessly encouraged Wilson.The Day of Judgment
They doubtlessly intended to camp for a portion of the night at this spot.The Trail-Hunter
- certain; assured
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 doubtlessly
Online Etymology Dictionary, © 2010 Douglas Harper