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 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 But the methods used in the show’s sting operations, as depicted here, uncomfortably skirt the dubious boundaries of entrapment. — David Rooney, HollywoodReporter, 5 Sep. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

Deablo a late add to game status Falcons linebacker Divine Deablo has been listed as questionable because of an illness, according to the team.

— AJC.com, AJC.com, 20 Sep. 2026
The Dolphins did not elevate long snapper Cal Adomitis, meaning that Tucker Addington -- who was listed as questionable with a shoulder injury -- should be able to play Sunday.

— Barry Jackson, Miami Herald, 19 Sep. 2026

Definition of questionable

Adjective

The decision to keep him home was framed as protective rather than reluctant.

— Jessica Lynch, Billboard, 20 Sep. 2026
But when Emma never shows up to their meeting, Pao and Dante will have to go on an epic quest— filled with awkward moments, sarcasm, and somewhat reluctant friendships—to save their best friend.

— Kavya Dhillon, Parents, 19 Sep. 2026

Definition of reluctant

Adjective

Critics of Prop 40 have also warned California’s levy is unlikely to be a one-time deal, and the letter sees a similar levy on billionaires elsewhere.

— Jason Ma, Fortune, 19 Sep. 2026
Thrifted clothes have become an unlikely fashion flex for Hollywood’s haute couture hoarders and other trend-setters.

— Los Angeles Times, Los Angeles Times, 19 Sep. 2026

Definition of unlikely

Adjective

Be skeptical of guarantees that depend on platforms the firm does not control.

— Scott Keever, Forbes.com, 15 Sep. 2026
Unlike Portugal, and to a lesser extent British Columbia, Oregon also failed to secure buy-in from law enforcement, leaving many officers opposed to the policy and skeptical of their role in implementing it.

— Karyn Sporer, The Conversation, 14 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

Even the study’s researchers are hesitant to apply an actual number of biological years gained based on the findings.

— Korin Miller, Allure, 18 Sep. 2026
Some consumers are hesitant to do so, for fear that failing to pay will hurt their credit scores, Collins noted.

— Megan Cerullo, CBS News, 17 Sep. 2026

Definition of hesitant

Adjective

Patrick looked unsure of his dad’s abilities in this playful shot shared for Arnold’s 75th birthday in 2022.

— Stephanie Sengwe, PEOPLE, 18 Sep. 2026
Still, a $50,000 5-year CD won't be the best idea for most savers, especially those unsure of their capacity to keep the funds frozen in the account for the full term.

— Matt Richardson, CBS News, 17 Sep. 2026

Definition of unsure

Adjective

Kanarek also called 911, to report a suspicious vehicle and a possibly threatening conversation recorded by the device in her locker.

— Ian Parker, New Yorker, 14 Sep. 2026
But Mark, in Ronson’s telling, quickly grows antagonistic, abruptly asking Ronson to sign an NDA, then later barraging him with suspicious texts and threatening him with a pair of goons.

— Jeremy Gordon, The Atlantic, 14 Sep. 2026

Definition of suspicious

Browse Nearby Words

dubiety

dubious

dubiously

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 22 Sep. 2026.

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Synonyms of dubious

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