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

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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 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 Regarding Haaland’s goal, Michael Carrick commented that the lines drawn were dubious. — Graham Scott, New York Times, 15 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

The task got even greater when Ja’Marr Chase and Tee Higgins, both of whom came into Sunday’s game as questionable, was given the go-ahead.

— Miami Herald, Miami Herald, 11 Oct. 2026
But under pressure to lend, many loans went to questionable borrowers.

— Jason Ma, Fortune, 11 Oct. 2026

Definition of questionable

Adjective

Unlike other reluctant sources, though, Bragg wouldn’t even help him with fact checking.

— Charles Bethea, New Yorker, 9 Oct. 2026
Mark is reluctant to put up their impressive Westside home as loan collateral, but Sam persuades him that the risk will pay off and the election is all but sewn up.

— David Rooney, HollywoodReporter, 8 Oct. 2026

Definition of reluctant

Adjective

Rain rates are probably going to be a quarter of an inch per hour or less, making debris flow and landslides unlikely.

— Hannah Fry, Los Angeles Times, 10 Oct. 2026
The Times’ belated discovery of Bragg’s malpractice emerged through an unlikely incident that has not been reported in full.

— Charles Bethea, New Yorker, 9 Oct. 2026

Definition of unlikely

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

And considering scoring has been at a premium for Florida — the Panthers have nine goals through five games — Maurice might have been hesitant to fully dismantle a group that’s producing.

— Jordan McPherson, Miami Herald, 11 Oct. 2026
Why is private philanthropy hesitant to step in to cover underfunded programs that have been abandoned by many governments?

— Mohammed Sergie, semafor.com, 8 Oct. 2026

Definition of hesitant

Adjective

So fraternities promise that kind of friendship and loyalty, and also for young people, 18-year-olds, many of whom are unsure of themselves, fraternities and sororities say this is the way to be popular.

— Richard Hall, Time, 7 Oct. 2026
The department was unsure of the route the aircraft was trying to take, and the crash started a small grass fire that was quickly doused.

— Matthew Ablon, CBS News, 7 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

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Style

“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 14 Oct. 2026.

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Synonyms of dubious

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