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 But joining the Nasdaq index has done little to convince critics, who are dubious about the lofty aims of the company. — Eleanor Pringle, Fortune, 8 July 2026 DeSantis is also on pace to exceed other dubious distinctions. — Orlando Sentinel, The Orlando Sentinel, 8 July 2026 The detective was dubious that a rape had occurred, according to his preliminary report. — Joaquin Sapien, ProPublica, 30 June 2026 In multiple lawsuits that are now combined, Nutex investors accuse the company of hiding its partnership with HaloMD and say the dubious arrangement exposes the company to further legal risks. — Tara Bannow, STAT, 29 June 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

There have also been controversial VAR calls, like the questionable foul that led to an Egyptian goal against Argentina being annulled.

— Jasmine Garsd, NPR, 20 July 2026
Paying the price of a luxury car for a giant silicone doll that needs to be recharged every two to four hours seems like a questionable choice.

— Maryna Holovnova, New Atlas, 19 July 2026

Definition of questionable

Adjective

The French government has historically been far more accommodating toward Moscow than either London or Washington, and the TotalEnergies leadership was visibly reluctant to sever ties with Russia ties throughout the conflict.

— Ariel Cohen, Forbes.com, 21 July 2026
Many people were reluctant to speak, as if the virus were taboo.

— Brittney Melton, NPR, 21 July 2026

Definition of reluctant

Adjective

Getty Images At first sight, Hannia Zia and Joana Ferreira are unlikely founders of a start-up promising to shake up the American construction industry.

— David Prosser, Forbes.com, 21 July 2026
Many of the athletes represented are unlikely to earn significant NIL money—some might not earn any—by playing another season.

— Michael McCann, Sportico.com, 20 July 2026

Definition of unlikely

Adjective

Al Khafaji’s nay-sayers weren’t wrong to be skeptical about the construction space.

— Lily Mae Lazarus, Fortune, 15 July 2026
Despite their differing opinions on Oppenheimer, everyone in the studio was jazzed to see what Nolan had made (though Hannah was a little skeptical of Matt Damon as Odysseus).

— Alex Jhamb Burns, Vogue, 14 July 2026

Definition of skeptical

Adjective

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
Speech — Intimidation as censorship The First Amendment protects disputable speech, not agreeable.

— Brielle Miller, Baltimore Sun, 9 Mar. 2026

Definition of disputable

Adjective

Nguyen was excited to enjoy a warm summer outdoors before the smoke left her hesitant to step outside for her routine runs to the National Mall and daily walks with her dog.

— Dalia Faheid, CNN Money, 18 July 2026
At the time, the now Academy Award-winning director had just three films on his résumé, and unlike Nolan’s typically eager actors, Freeman was hesitant to take the part.

— Emma Urdangen, PEOPLE, 18 July 2026

Definition of hesitant

Adjective

Funding fights, shifting eligibility rules and abrupt program cuts have played out simultaneously at the federal level, leaving many organizations unsure what the ground will look like from one quarter to the next.

— Keely Cat-Wells, Forbes.com, 22 July 2026
At a time when many of their peers are unsure of what's next, the students are happy their skills are in demand.

— Andrea Hsu, NPR, 21 July 2026

Definition of unsure

Adjective

Review your bank and credit card statements for suspicious activity.

— Brian Sloan,Dan Avery, CNBC, 15 July 2026
Some doubt whether the model can survive here, let alone be exported to countries that are larger, less homogeneous and more suspicious of taxation.

— Nicholas D. Kristof, Mercury News, 14 July 2026

Definition of suspicious

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 23 Jul. 2026.

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