DOUBTLESS Synonyms: 89 Similar and Opposite Words

doubtless 1 of 2

adjective

Definition of doubtless

as in sure

having or showing a mind free from doubt another one of his doubtless predictions that will never come true

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Antonyms & Near Antonyms

doubtless

2 of 2

adverb

ˈdau̇t-ləs

as in certainly

without any question she is doubtless the one and only girl for me

Synonyms & Similar Words

as in probably

by reasonable assumption doubtless you have heard this story before, but I'll tell it anyway

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Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of doubtless

Adjective

And the all-boffo, all-the-time production is exhausting (which is doubtless why the rare quiet moments stand out). — Bill Goodykoontz, The Arizona Republic, 29 Nov. 2022 Like Shannon, Natalie followed a circuitous musical path, dabbling in noise rock and once fronting a band called Satanized, doubtless to the delight of her Pentecostal parents. — Daniel De Visé, SPIN, 13 Sep. 2022

Adverb

But the show’s creatives have been looking to deftly expand Rowling’s beloved source material and will doubtless find some fresh ways to elevate the story. — James Hibberd, HollywoodReporter, 6 May 2026 Savings here and there are doubtless feasible. — Editorial, Boston Herald, 17 Apr. 2026 See All Example Sentences for doubtless

Recent Examples of Synonyms for doubtless

Adjective

After all, nobody can say for sure when a weather catastrophe may happen.

— Peter Prengaman, Fortune, 24 Aug. 2026
Scientists still aren’t sure why the lichen prefers these specific rocks, but early evidence suggests the phenomenon isn’t localized.

— Mrigakshi Dixit, Interesting Engineering, 24 Aug. 2026

Definition of sure

Adverb

The young Moroccan caught the eye at the World Cup and certainly has the potential to become one of the best deep-lying midfielders in the game.

— Graham Ruthven, Forbes.com, 19 Aug. 2026
Over the past several years, South Korea has emerged as a world-class military power – not quite on the level of the US or China, but certainly capable of defending itself against North Korea.

— Brad Lendon, CNN Money, 19 Aug. 2026

Definition of certainly

Adverb

Not a forest by any means, but a small woods where there are squirrels and chipmunks, probably snakes and skunks, rabbits and, now and then, passing through on some mysterious transient route, a deer or a family of deer.

— Literary Hub, Literary Hub, 24 Aug. 2026
And that’s probably going to be an extra big problem when people are cooped up at a remote mining outpost.

— Sergio Pereira, Space.com, 24 Aug. 2026

Definition of probably

Adjective

At that point, the Spanish club was confident he would soon be snapped up by one of the game’s giants for mega money, so was happy to play the long game.

— Ben Church, CNN Money, 21 Aug. 2026
People that are not very confident don’t want to hear another voice, especially a different voice.

— Elise Devlin, New York Times, 21 Aug. 2026

Definition of confident

Adverb

Two of their best relievers surely would have helped, but each was used so much during the summer win streak that elbow soreness sidelined them.

— Jen McCaffrey, New York Times, 20 Aug. 2026
The neighborhood Just moments from Lamb’s Conduit Street and directly behind the British Museum, the location is surely hard to beat for those seeking a truly London experience.

— Condé Nast, Condé Nast Traveler, 18 Aug. 2026

Definition of surely

Adjective

Playing some of the most assured tennis of his career, Brandon Nakashima slowed Rafael Jódar’s roll Wednesday at the Canadian Open in Montreal, beating the red-hot teenager 7-6(3), 6-4 to advance to the biggest final of his career.

— Ava Wallace, New York Times, 13 Aug. 2026
For those looking for an M390 folder that combines efficient cutting geometry with a fuller, more assured grip, Hornbill presents a compelling evolution of Titaner’s knife lineup.

— New Atlas, New Atlas, 21 July 2026