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 HoverAir, an imprint of China's Zero Zero Robotics, has the dubious honor of being the first victim of the FCC's foreign drone ban. — Jim Fisher, PC Magazine, 18 Aug. 2026 But others are still dubious that the city will fulfill its promises — or that the project itself will ever be finished. — Jack Flemming, Los Angeles Times, 14 Aug. 2026 Patients encountering a dubious medical claim on TikTok, YouTube, or a podcast rarely have an equivalent source of evidence available in the same moment. — Avi Tuschman, STAT, 13 Aug. 2026 Over time, as players bluff, bargain, and make increasingly dubious trades, trust starts to erode, more and more adverse selection happens — and the game descends into a kind of joyful chaos. — Greg Rosalsky, NPR, 11 Aug. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

Currently at issue are three forms of gambling — two legal, one questionable.

— Joe Ferguson, Chicago Tribune, 25 Aug. 2026
Johnny Marr has another message for those with questionable perspectives.

— SPIN Staff, SPIN, 25 Aug. 2026

Definition of questionable

Adjective

Lancaster County is known as the heart of Pennsylvania’s Amish community, a religious group that is sometimes reluctant to embrace modern medical interventions such as vaccines.

— Mike Stobbe, Chicago Tribune, 25 Aug. 2026
The problem this creates is that refs can be reluctant to award a second yellow.

— Graham Scott, New York Times, 25 Aug. 2026

Definition of reluctant

Adjective

That’s unlikely to change now, especially as China sees how unpopular the ongoing conflict has been within the US and abroad, and as Chinese leader Xi Jinping is set to visit the United States next month.

— Nadeen Ebrahim, CNN Money, 24 Aug. 2026
However, working part-time is unlikely to improve your eligibility for federal student loans.

— Amy DeYoung, USA Today, 24 Aug. 2026

Definition of unlikely

Adjective

The tie-up should help some skeptical investors grow more confident that Salesforce — thanks to troves of proprietary customer data housed within its applications — has a role to play in this new AI world.

— Kevin Stankiewicz, CNBC, 27 Aug. 2026
Price likened his attraction to the format to his early embrace of streaming entertainment back in the days when Hollywood remained skeptical of its staying power.

— Katie Kilkenny, HollywoodReporter, 26 Aug. 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

But after descending into the genre for the series and then returning for its sudden ending, Brown can’t exactly blame those hesitant to do the same.

— Hunter Ingram, Variety, 21 Aug. 2026
Approaching hesitant individuals Health experts said that addressing vaccine-hesitant people starts with listening rather than lecturing.

— Annika Kim Constantino, CNBC, 21 Aug. 2026

Definition of hesitant

Adjective

Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people's fears and distrust of the federal government.

— ABC News, ABC News, 25 Aug. 2026
Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people’s fears and distrust of the federal government.

— Sarah Raza, Los Angeles Times, 25 Aug. 2026

Definition of unsure

Adjective

Luke Halls’ video and projections add another layer of visual unease, allowing screens and technology inside the home to become as suspicious as its shadowy corners.

— Dave Quinn, PEOPLE, 26 Aug. 2026
As Joan Acocella wrote for this magazine, in 2008, a suspicious number of cures happen to include alcohol as a main ingredient.

— Shayla Love, New Yorker, 26 Aug. 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 28 Aug. 2026.

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