doubtless

[ dout-lis ]

/ ˈdaʊt lɪs /

SEE MORE SYNONYMS FOR doubtless ON THESAURUS.COM

adverb Also doubt·less·ly.

without doubt; certainly; surely; unquestionably.

probably or presumably.

adjective

free from doubt or uncertainty; certain, sure.

Nearby words

doubly armed suture, doubs, doubt, doubtful, doubting thomas, doubtless, douc, douce, douceperes, douceur, douche

Origin of doubtless

First recorded in 1300–50, doubtless is from the Middle English word douteles. See doubt, -less

Related forms

doubt·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. 2019

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)|Amy Zimmerman|June 3, 2014|DAILY BEAST
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|Robert Shrum|July 31, 2012|DAILY BEAST
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|DAILY BEAST
Besides, consciously or unconsciously, you have doubtlessly encouraged Wilson.
The Day of Judgment|Joseph Hocking

In order to learn to organize his material, he has doubtlessly unconsciously lessened its density and vibrancy for the time being.
Musical Portraits|Paul Rosenfeld
This also must doubtlessly be rejected, as Haberlandt has observed.
At the Deathbed of Darwinism|Eberhard Dennert
They must he doubtlessly gathering to witness my execution and listen to the auguries of the priestess.
The Casque's Lark|Eugne Sue
Doubtlessly the Christmas spirit got into Betty Gwins typewriter keys.
Local Color|Irvin S. Cobb

British Dictionary definitions for doubtlessly

doubtless

/ (ˈdaʊtlɪs) /

adverb Also: doubtlessly (sentence substitute or sentence modifier)

certainly

probably

adjective

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