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 Discussions about limiting Iran’s nuclear program are formidably complex, with challenges that are both technical (determining the speeds of centrifuges that can be used) and diplomatic (verifying the Iranians’ often dubious claims of disarmament). — Dexter Filkins, New Yorker, 14 Sep. 2026 The sleek, gold-colored coupé impressed with a futuristic design, but baffled onlookers with its cramped two-seat interior, lack of a charging port, and a dubious, far-too-good-to-be-true $30,000 price tag. — Victor Tangermann, Futurism, 10 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 Another online retelling from a dubious source cited in Wikipedia even puts him in Oklahoma. — Bud Kennedy, Fort Worth Star-Telegram, 9 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

The third-year receiver was questionable coming into Sunday with an ankle injury.

— Alex Zietlow, Charlotte Observer, 27 Sep. 2026
After initially being ruled as questionable, he was soon downgraded to out near the start of the third quarter.

— Miami Herald, Miami Herald, 27 Sep. 2026

Definition of questionable

Adjective

After sharing her story in her 2024 memoir Be Ready When The Luck Happens, Ina Garten is reluctant to trust a filmmaker with the adaptation.

— Glenn Garner, Deadline, 26 Sep. 2026
However, Weber was reluctant to conclude that meant Hitler therefore murdered his niece.

— Sophie Tanno, CNN Money, 25 Sep. 2026

Definition of reluctant

Adjective

Some have academic credentials that would make admission through Harvard’s front door highly unlikely.

— Jayson Weingarten, Fortune, 26 Sep. 2026
Fazio was one of only four senators to oppose the bill that passed with overwhelming bipartisan support, saying the state should defer to federal action that seems unlikely, given the opposition of the president.

— Mark Pazniokas, Hartford Courant, 25 Sep. 2026

Definition of unlikely

Adjective

The pledge from Walmart comes as concerns are mounting from some shoppers, consumer advocates and lawmakers skeptical about the rollout of digital price labels by the discounter and other stores.

— Anne D’Innocenzio, Los Angeles Times, 28 Sep. 2026
Gary Marcus, a cognitive scientist known for his research on the intersection of psychology and AI, is also skeptical that AI agents could paralyze the internet.

— Megan Cerullo, CBS News, 28 Sep. 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

Initially hesitant, David connected with the FBI in an effort to prove that his wife’s theory was false.

— Jane LaCroix, PEOPLE, 26 Sep. 2026
Until recently, city leaders were hesitant to commit Measure ULA funds over concerns that the tax could be overturned in court.

— Jack Flemming, Los Angeles Times, 23 Sep. 2026

Definition of hesitant

Adjective

Directed by Li Taige, the film stars Yu Qian as a retiring veteran police officer who discovers suspicious anomalies during an apparently routine theft investigation.

— Naman Ramachandran, Variety, 28 Sep. 2026
Five men were arrested near RAF Fairford in southwest England on September 27 after police received a report about three suspicious vans heading toward the air base.

— Sujita Sinha, Interesting Engineering, 28 Sep. 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 1 Oct. 2026.

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Synonyms of dubious

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