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 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 The movie is a comic and affectionate portrait of a quixotic if mathematically dubious dream. — ABC News, 16 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

Falcons defensive end Za'Darius Smith (neck) is active after being listed as questionable.

— ABC News, ABC News, 18 Oct. 2026
Buffalo could score efficiently without needing its questionable receivers at full strength.

— Dan Zaksheske OutKick, FOXNews.com, 18 Oct. 2026

Definition of questionable

Adjective

In the post-George Floyd era, some young adults have been reluctant to become police officers compared to the days when departments were flooded with applications from eager jobseekers.

— Christopher Keating, Hartford Courant, 18 Oct. 2026
Day told the Herald that Fencebridge has been operating in Haiti for four years but was reluctant to offer details about that work.

— Jacqueline Charles, Miami Herald, 17 Oct. 2026

Definition of reluctant

Adjective

In one image, Grande’s Olivia Jones stands beside De Niro’s Byrnes, who wears a decidedly skeptical expression, her hand resting on his German shepherd.

— Alicia Urrea, Billboard, 12 Oct. 2026
Jorge Piñón, an energy researcher at the University of Texas at Austin, is skeptical of the data and noted that only sanctioned Cuban state energy company CUPET has the capacity to store such a large quantity of fuel in one month.

— Nora Gámez Torres, Miami Herald, 12 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

Chang was still hesitant to believe that Raman was actually going to win, having watched Hong’s polling advantage in Wisconsin evaporate.

— Benjamin Wallace-Wells, New Yorker, 18 Oct. 2026
None of these feel significant to the business, but each one gives a hesitant buyer a reason to pause, and pauses are where deals go to die.

— Dr. Sariki Abungwo, Forbes.com, 16 Oct. 2026

Definition of hesitant

Adjective

Residents said most of the children killed lived in the Dir Colony neighborhood, where the school is located, leaving them unsure which bereaved family to visit first to offer condolences.

— Arkansas Online, Arkansas Online, 16 Oct. 2026
Hujar is unsure of his prospects, curious where his talent and ambition might lead, embedded in a community that may or may not take him there.

— Literary Hub, Literary Hub, 16 Oct. 2026

Definition of unsure

Adjective

Strong antivirus software can help detect malicious downloads, suspicious links and other threats that may show up in follow-up scams.

— Kurt Knutsson, FOXNews.com, 12 Oct. 2026
Abby became suspicious of Kuehl during a private conversation about possible traitors in the group.

— Lisa Gutierrez, Kansas City Star, 12 Oct. 2026

Definition of suspicious

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dubiety

dubious

dubiously

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 19 Oct. 2026.

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Synonyms of dubious

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