DUBIOUS Synonyms: 142 Similar and Opposite Words

Q: How does the adjective 'dubious' contrast with its synonyms?

Some common synonyms of dubious are doubtful , problematic , and questionable . While all these words mean "not affording assurance of the worth, soundness, or certainty of something," dubious stresses suspicion, mistrust, or hesitation. // dubious about the practicality of the scheme

Q: When would 'doubtful' be a good substitute for 'dubious'?

The meanings of doubtful and dubious largely overlap; however, doubtful implies little more than a lack of conviction or certainty. // doubtful about whether I said the right thing

Q: Where would 'problematic' be a reasonable alternative to 'dubious'?

While in some cases nearly identical to dubious , problematic applies especially to things whose existence, meaning, fulfillment, or realization is highly uncertain. // whether the project will ever be finished is problematic

Q: When could 'questionable' be used to replace 'dubious'?

The words questionable and dubious can be used in similar contexts, but questionable may imply no more than the existence of doubt but usually suggests that the suspicions are well-grounded. // a man of questionable honesty

dubious

adjective

ˈdü-bē-əs

Definition of dubious

as in questionable

giving good reason for being doubted, questioned, or challenged any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in reluctant

slow to begin or proceed with a course of action because of doubts or uncertainty I'm dubious about our plan to go hang gliding without having had any training

Synonyms & Similar Words

Antonyms & Near Antonyms

as in unlikely

not likely to be true or to occur made the dubious claim of being of royal blood

Synonyms & Similar Words

Antonyms & Near Antonyms

as in skeptical

not feeling sure about the truth, wisdom, or trustworthiness of someone or something dubious about a diet that claims I can eat all I want and still lose weight

Synonyms & Similar Words

Antonyms & Near Antonyms

Synonym Chooser

How does the adjective dubious contrast with its synonyms?

Some common synonyms of dubious are doubtful, problematic, and questionable. While all these words mean "not affording assurance of the worth, soundness, or certainty of something," dubious stresses suspicion, mistrust, or hesitation.

dubious about the practicality of the scheme

When would doubtful be a good substitute for dubious?

The meanings of doubtful and dubious largely overlap; however, doubtful implies little more than a lack of conviction or certainty.

doubtful about whether I said the right thing

Where would problematic be a reasonable alternative to dubious?

While in some cases nearly identical to dubious, problematic applies especially to things whose existence, meaning, fulfillment, or realization is highly uncertain.

whether the project will ever be finished is problematic

When could questionable be used to replace dubious?

The words questionable and dubious can be used in similar contexts, but questionable may imply no more than the existence of doubt but usually suggests that the suspicions are well-grounded.

a man of questionable honesty

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 dubious In the latest dubious milestone for US Treasuries, the yield on the 10-year benchmark note just hit its highest level since the dot-com bust. — David Goldman, CNN Money, 1 Oct. 2026 Some have done so, the prosecutor explained, by slow-walking directives of dubious merit, such as orders to investigate voter fraud by noncitizens—a phenomenon that Trump has falsely claimed is rampant. — Eyal Press, New Yorker, 28 Sep. 2026 How else could that show have ended, the way people were being entrapped, and, certainly, with the dubious legality of it all? — Damon Wise, Deadline, 28 Sep. 2026 But what really makes Walker’s story all the more surreal-special are the twists that made his football future appear dubious. — Kansas City Star, 18 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

Puka Nacua shined despite entering the game questionable with a calf injury and Kyren Williams and Blake Corum combined for nearly 200 rushing yards.

— Los Angeles Times, Los Angeles Times, 25 Oct. 2026
He was listed as questionable to return as he was examined in the injury tent.

— ABC News, ABC News, 25 Oct. 2026

Definition of questionable

Adjective

Still, the prospect of additional supply from American producers remains uncertain, with companies reluctant to commit to major new investments amid volatile prices and geopolitical risks.

— Lee Ying Shan, CNBC, 26 Oct. 2026
Cast as Eva, the head of an international organization trying to save the planet in Project Hail Mary, Hüller spends this sci-fi blockbuster strictly on terra firma, acting as a socially awkward, deadpan foil for Ryan Gosling’s reluctant astronaut.

— David Fear, Rolling Stone, 24 Oct. 2026

Definition of reluctant

Adjective

Friedman began her remarks by reminding the audience of von Furstenberg’s unlikely beginning, born in Brussels to a Holocaust survivor.

— Ariel Bielsky, Vogue, 24 Oct. 2026
Dahlia Scheindlin, a veteran pollster who works for left-of-center candidates and parties in Israel, speculated that the number of returning overseas voters was unlikely to be big enough to change the outcome of the election.

— Daniel Brook, New Yorker, 24 Oct. 2026

Definition of unlikely

Adjective

Others are skeptical the task force can accomplish much in such a short time period, arguing that eventually sweeping new legislation will be needed to regulate AI.

— Ashley Gold, semafor.com, 19 Oct. 2026
Though Netflix is profitable, analysts say the company hasn’t produced enough hits and are skeptical of its plans to grow its subscriber base.

— Samantha Masunaga, Los Angeles Times, 19 Oct. 2026

Definition of skeptical

Adjective

But revenue coming in at double the projections is not disputable and cannot happen if the tax base runs away.

— Teresa Ghilarducci, Forbes.com, 23 Aug. 2026
However, disputable refereeing decisions, especially in the matches against Italy and Spain, led to allegations that South Korea may have benefited from favorable officiating.

— Andrew Pereira, Encyclopedia Britannica, 18 June 2026

Definition of disputable

Adjective

Producers could use advanced technology to increase the recovery rate, but that requires major investments, which companies are hesitant to make in a country led by a government with a history of breaking contracts and current instability.

— ABC News, ABC News, 22 Oct. 2026
Former Hartford Association of Teachers President Carol Gale was not so hesitant.

— Theo Peck-Suzuki, Hartford Courant, 22 Oct. 2026

Definition of hesitant

Adjective

The Salt Lake County clerk requests assistance to secure the polls, but the sheriff, unsure about jurisdiction, declines.

— Barton Gellman, New Yorker, 25 Oct. 2026
The equipment truck had left spring training in Tempe, Arizona, and was in Salt Lake City, unsure where to go, when Selig called traveling secretary Tommy Ferguson, who had held the same job with the Braves.

— ABC News, ABC News, 24 Oct. 2026

Definition of unsure

Adjective

For all current and former Florida residents, FLHSMV recommended taking precautions, including monitoring financial accounts and reviewing credit reports for any suspicious activity.

— Ashley Belanger, ArsTechnica, 19 Oct. 2026
Researchers at iVerify discovered it while investigating a suspicious infection in August 2026.

— Kurt Knutsson, FOXNews.com, 19 Oct. 2026

Definition of suspicious

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dubious

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 26 Oct. 2026.

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Synonyms of dubious

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