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

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Antonyms & Near Antonyms

as in unlikely

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

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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

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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 The movie is a comic and affectionate portrait of a quixotic if mathematically dubious dream. — ABC News, 16 Sep. 2026 Millions of users have unknowingly become proxy nodes after installing free VPNs or dubious browser extensions, allowing attackers to create fake accounts, scrape data at scale and commit promo and payment fraud. — Dan Pinto, Forbes.com, 15 Sep. 2026 Regarding Haaland’s goal, Michael Carrick commented that the lines drawn were dubious. — Graham Scott, New York Times, 15 Sep. 2026 For years, collectors endured reissues of varying dubious quality, including some even cut at the wrong speed. — Brian McCollum, Freep.com, 10 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

That’s the only real update beyond what has already been announced, including cornerback Xavier Lucas still being out after initially being deemed questionable earlier in the week.

— Jordan McPherson, Miami Herald, 4 Oct. 2026
Rob Blanchard, spokesman for Lamont’s reelection campaign, countered Wednesday that Fazio recently proposed a questionable income tax-cutting plan that could weaken the state’s strong financial reputation.

— Keith M. Phaneuf, Hartford Courant, 4 Oct. 2026

Definition of questionable

Adjective

An April report from Japan External Trade Organization showed that companies are increasingly reluctant to expand their business in China.

— Anniek Bao,Lim Hui Jie, CNBC, 5 Oct. 2026
But as time went on, Matt was cagey around his phone and reluctant to call me his girlfriend.

— Richelle Meiss, Los Angeles Times, 2 Oct. 2026

Definition of reluctant

Adjective

The political situation in the United States may have made the prospect of an American pope seem even more unlikely.

— Scott Detrow, NPR, 3 Oct. 2026
The Justice Department argued the outlets are unlikely to succeed on their claims and urged Kelly to deny their request for a preliminary injunction.

— Rena Rowe, The Washington Examiner, 3 Oct. 2026

Definition of unlikely

Adjective

The conservative-majority Supreme Court has been skeptical of environmental regulations in the past, including in a 2022 decision limiting the EPA's authority to regulate carbon dioxide emissions from power plants.

— Arkansas Online, Arkansas Online, 6 Oct. 2026
And while The Atlantic has published largely skeptical coverage of major AI companies and their products’ impact on society, Thompson’s tone, in his podcasts and LinkedIn posts, has been more optimistic.

— Max Tani, semafor.com, 5 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

Tony Hanna, a parent of a Black Bob Elementary School student, said during public comments Thursday night that parents were unsure whether the six schools were the right choice.

— Kendrick Calfee, Kansas City Star, 3 Oct. 2026
Patriot batteries are being deployed, but communities are still developing civil-defense plans, leaving some residents unsure where to take shelter.

— Claudia Ciobanu, Los Angeles Times, 29 Sep. 2026

Definition of unsure

Adjective

Mongol rule had been deeply humiliating, and Ming leaders grew suspicious of foreign influence.

— Carl Minzner, Foreign Affairs, 5 Oct. 2026
The move comes as British counter-terrorism police investigate suspicious activity near the Royal Air Force station and amid reports that US commanders received new information about a possible threat involving Iran.

— Georgina Jedikovska, Interesting Engineering, 5 Oct. 2026

Definition of suspicious

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dubiety

dubious

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 7 Oct. 2026.

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Synonyms of dubious

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