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 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

Wikus van de Merwe (Sharlto Copley) plays a government agent working in the Department of Alien Affairs, who gets caught up in a world of questionable ethics and violence.

— Grace Dean, Space.com, 1 Sep. 2026
She was recently listed as questionable due to a back injury ahead of a game against the Toronto Tempo, but started both games against the expansion team last week.

— Tracy Brown, Los Angeles Times, 31 Aug. 2026

Definition of questionable

Adjective

Families are making difficult decisions with some residents reluctant to leave their homes.

— Dana Taylor, USA Today, 1 Sep. 2026
The penalties are a key point because, though the judge could clear the players to be eligible, a school may still be reluctant to risk being penalized by the conference.

— Seth Emerson, New York Times, 31 Aug. 2026

Definition of reluctant

Adjective

And given their preference for rocky environments over sandy lagoons and the crabs’ reproductive prowess, fishermen and experts alike are skeptical.

— ABC News, ABC News, 2 Sep. 2026
The early sales reps who thrived on instinct and relationships start selling into a market that’s crowded, educated and skeptical.

— Doug May, Forbes.com, 2 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

Determined to find her in real life, Ted talks a hesitant Lenny into joining him on a road trip to Clearwater Beach, Florida.

— Derek Lawrence, Entertainment Weekly, 28 Aug. 2026
Determined to find her in real life, Ted talks a hesitant Lenny into joining him on a road trip to Clearwater Beach, FL.

— Anthony D'Alessandro, Deadline, 28 Aug. 2026

Definition of hesitant

Adjective

Margarita, who studied jewelry design, is unsure whether Princess Margaret would have been a fan of her jewelry preferences.

— Bailey Bujnosek, InStyle, 1 Sep. 2026
For the first ten minutes, the audience seems a little unsure where any of this is going — something Lyons is self-aware enough to address.

— Rebecca Rosman, NPR, 31 Aug. 2026

Definition of unsure

Adjective

Glendale police received multiple calls about a suspicious male adult, with officers first responding to a retail store in the 1500 block of Glenoaks Boulevard.

— Andrew J. Campa, Los Angeles Times, 2 Sep. 2026
By the time something appears suspicious, causality is fragmented across systems, logs and identities.

— Brian Contos, Forbes.com, 2 Sep. 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 3 Sep. 2026.

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