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

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

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

Other people aren’t always so sure who John Malkovich is either.

— Los Angeles Times, Los Angeles Times, 31 Aug. 2026
Shopping a single designer’s collection is also a sure-fire way to have a cohesive nursery that isn’t too matchy-matchy.

— Julia Harrison, Architectural Digest, 31 Aug. 2026

Definition of sure

Adverb

Five to six years ago, certainly, people were not thinking about agentic AI systems that can plan and complete multi-step tasks with little to no human intervention.

— Zev Fima, CNBC, 2 Sep. 2026
Olsen certainly hurt those around him, too, growing up, especially as his addiction spiraled and his platonic, romantic and familial relationships fell apart.

— David Oliver, USA Today, 2 Sep. 2026

Definition of certainly

Adverb

There are no Cubs players involved in the TikTok series, the Cubs told me, which is unfortunate since Crow-Armstrong has acting in his DNA — his mother and father are both actors — and probably would be at least as good as Damon.

— Paul Sullivan, Chicago Tribune, 1 Sep. 2026
Tom Even non-football fans can probably guess who this one is about.

— Beth Ann Mayer, Parents, 1 Sep. 2026

Definition of probably

Adjective

Other than that, he’s never seemed confident that the future will turn out all right, although he’s kept on working out his worries onscreen, forever hunting for flakes of hope in the rubble.

— Amy Nicholson, Los Angeles Times, 28 Aug. 2026
Coyote first hoodwinks and then forces Kevin into his lawsuit plans, taking Acme to task in a way the corporation, confident in its imperviousness, finds laughable.

— Angelica Jade Bastién, Vulture, 28 Aug. 2026

Definition of confident

Adverb

The price was steep for Evangelista, but the first-round pick will likely be late in the round assuming Colorado remains one of the top teams in the league.

— Peter Baugh, New York Times, 2 Sep. 2026
Other people who have these kinds of professions can challenge themselves by not relying on navigation devices, and their brains will likely benefit from it, Wood says.

— Renée Onque, CNBC, 2 Sep. 2026

Definition of likely

Adjective

Both policies share an emphasis on supporting the commercial space industry and underscore the importance of assured access to space.

— Stephen Clark, ArsTechnica, 21 Aug. 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

Issa doesn’t really want to sleep with Anton, and Anton definitely doesn’t want to sleep with Issa, but both of them do want to sleep with Paul Baker.

— Ben Rosenstock, Vulture, 28 Aug. 2026
The video was definitely a hit, but for a parent, that much attention can bring mixed emotions, especially when some of the reactions include praise but others are not so kind.

— Owen Carry, USA Today, 28 Aug. 2026