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

Tim Boyd San Juan Capistrano I’m sure there are Dodgers fans unhappy about losing to the Brewers.

— Los Angeles Times, Los Angeles Times, 17 Oct. 2026
Lying to Grace bought Kate some time, sure, but the cost is vertiginously steep.

— Sophie Brookover, Vulture, 17 Oct. 2026

Definition of sure

Adverb

The song makes clear that while Jake Shane might not be this generation’s Truman Capote, Troye Sivan certainly isn’t either.

— Harry Tafoya, Pitchfork, 14 Oct. 2026
There’s certainly many of these systems that have been found in nature, but a good number of them have gone on to be developed into useful tools.

— Adam Kovac, Scientific American, 14 Oct. 2026

Definition of certainly

Adverb

After all, Jonathan, who was probably alive for President Andrew Jackson's second inauguration in 1833, is still thriving.

— KYLE MELNICK THE WASHINGTON POST, Arkansas Online, 18 Oct. 2026
But being an editor probably makes writing first drafts harder, or at least slower.

— Lola Seaton, The New York Review of Books, 17 Oct. 2026

Definition of probably

Adjective

But that concern has been addressed here thanks to the aforementioned brake upgrades, which deliver confident stopping power at speed as well as excellent pedal feel.

— Bradley Iger, Robb Report, 16 Oct. 2026
Jim is confident Kimberly-Clark can unlock value from the Tylenol maker, which was spun off from healthcare giant and Club name Johnson & Johnson in 2023 and struggled to find its footing as a standalone entity.

— Natasha Abellard, CNBC, 16 Oct. 2026

Definition of confident

Adverb

Tyson, a student of boxing history, surely would have appreciated a deeper discussion of the role of the Black heavyweight champion in culture.

— Daniel Fienberg, HollywoodReporter, 13 Oct. 2026
Unbearably painful and enraging for the one, surely pretty darn awkward for the other.

— Gil Kaufman, Billboard, 13 Oct. 2026

Definition of surely

Adverb

Authorities then located his body, which had head injuries that were likely caused by blunt objects, according to officials.

— Adam Sabes, FOXNews.com, 14 Oct. 2026
Instead, the dual-garage door — Double Shift fans likely remember it — will open during mild weather days.

— Kansas City Star, Kansas City Star, 14 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