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

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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 detective was dubious that a rape had occurred, according to his preliminary report. — Joaquin Sapien, ProPublica, 30 June 2026 Valdez would have been the most radical member of the delegation, but that dubious distinction will now go to Avila Chevalier. — New York Daily News Editorial Board, New York Daily News, 25 June 2026 The actual economics of AI automation, meanwhile, remain pretty dubious. — Frank Landymore, Futurism, 25 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

Whether the Idaho and West Virginia laws genuinely protect girls from unfair competition is questionable.

— Business Columnist, Los Angeles Times, 7 July 2026
Holloway's high-volume striking and McGregor's questionable gas tank are key factors.

— Trent Reinsmith, Forbes.com, 7 July 2026

Definition of questionable

Adjective

Martha Washington — America’s first first lady, although such a title had not yet been coined — was reluctant to move to the new presidential household in New York and struggled with her new role as a hostess of presidential drawing rooms.

— Jenny Jarvie Follow, Los Angeles Times, 7 July 2026
If the labor market weakens, then the FOMC may be a little more reluctant to raise interest rates due to risking job losses and a potential economic slowdown.

— Simon Moore, Forbes.com, 7 July 2026

Definition of reluctant

Adjective

When Axsome went public in 2015, Wall Street was skeptical and the company’s stock puttered along under $10 for years.

— Amy Feldman, Forbes.com, 1 July 2026
Contrary to what the public has been led to believe, America’s Founding Fathers were skeptical and anxious about democracy.

— Steve H. Hanke, Fortune, 1 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

When team members seem disconnected, less motivated or hesitant to contribute, leaders need to look beyond surface-level symptoms and determine what’s really standing in the way of stronger participation and performance.

— Expert Panel®, Forbes.com, 1 July 2026
Some delegates were hesitant, but a committee was appointed to draft the document.

— Encyclopedia Britannica, Encyclopedia Britannica, 1 July 2026

Definition of hesitant

Adjective

Essentially, markets believe that interest rates will rise in 2026 but are unsure of both the magnitude and timing.

— Simon Moore, Forbes.com, 7 July 2026
Engineers are unsure of the condition of Swift’s thermal insulation, and ground controllers will take a cautious approach to determining where and when Link’s robotic arms can capture the satellite.

— Stephen Clark, ArsTechnica, 6 July 2026

Definition of unsure

Adjective

Large-scale events involve tabletop exercises with law enforcement, fire departments, emergency managers and venue officials running through countless scenarios — evacuations, suspicious packages, drones and crowd surges.

— Bryan West, USA Today, 1 July 2026
Residents who witness suspicious activity can contact non-emergency dispatch at 503-629-0111 or call 911 when appropriate.

— Bonny Chu, FOXNews.com, 1 July 2026

Definition of suspicious

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dubious

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 8 Jul. 2026.

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Synonyms of dubious

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