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

Synonyms & Similar Words

Relevance

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

Synonyms & Similar Words

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

Even moderately keen cornering produces body roll and would bring doubtless admonition from the rear seats. — Mike Duff, Car and Driver, 18 Aug. 2023 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

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

Meanwhile, the centrists are not sure where to situate themselves.

— Isaac Chotiner, New Yorker, 23 Oct. 2026
The mini-motorhome also comes with plenty of features sure to make your next road trip more comfortable.

— Bryan Hood, Robb Report, 23 Oct. 2026

Definition of sure

Adverb

While the iPhone Duo’s software certainly felt much smoother and more fluid than Android alternatives, many of its core features have been available on Samsung or Google phones for years.

— Lisa Eadicicco, CNN Money, 21 Oct. 2026
From broader cultural debates, including race and equity, to how the league enforces its rules, there are certainly things the new WNBA commissioner will need to address next season and beyond.

— Scott Thompson OutKick, FOXNews.com, 21 Oct. 2026

Definition of certainly

Adverb

So the theoretical maximum is 256 ESSMs rather than 64 missiles, although a practical loadout would probably mix missile types.

— Christopher McFadden, Interesting Engineering, 24 Oct. 2026
The overall answer probably won't surprise you, but the nitty-gritty details might.

— Joe Osborne, PC Magazine, 24 Oct. 2026

Definition of probably

Adjective

If Taipei refrains from crossing the ultimate red line of declaring formal independence, Beijing appears confident in its long-term strategy of integration.

— Ningrong Liu, Fortune, 23 Oct. 2026
In short, analysts are confident that music streaming services such as Spotify can enforce strict account policies, raise prices, and still make more money.

— Nick Indge, ArsTechnica, 23 Oct. 2026

Definition of confident

Adverb

August Barron was one of the breakout shows of the season; this windswept look will surely find its way onto the right red carpet.

— Joan Kennedy, Vogue, 20 Oct. 2026
To move forward and, one day, make reparation would surely mean including voices that might have made Mike Wallace nervous, and perhaps fall well outside Weiss’s favored forty-yard lines.

— Vinson Cunningham, New Yorker, 18 Oct. 2026

Definition of surely

Adverb

Unwinding the administration’s investments would prove legally and politically difficult — but Democrats likely won’t want to, at least not right away.

— Eleanor Mueller, semafor.com, 22 Oct. 2026
Global energy markets are likely more than a year away from returning to normal, the head of the International Energy Agency warned on Tuesday.

— Matt Egan, CNN Money, 21 Oct. 2026

Definition of likely

Adjective

The chances of a major US contribution to ESA’s next mission to Venus, named Envision, are less assured.

— Stephen Clark, ArsTechnica, 7 Oct. 2026
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

Definition of assured

Adverb

Halloween candy hasn’t even been handed out yet, but Hilary Duff is definitely in a Christmas mood already.

— Gil Kaufman, Billboard, 23 Oct. 2026
Nolan will, most definitely, be in the running for best director once again, while the likes of Matt Damon, Anne Hathaway, Samantha Morton, and Robert Pattinson are jostling for position in the various acting races.

— Radhika Seth, Vogue, 23 Oct. 2026