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

Synonyms & Similar Words

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 Koontz’s novelization of Larry Block’s screenplay (for Tobe Hooper’s 1981 film) has the dubious distinction of being one of the best movie novelizations ever written. — Declan Gallagher, Entertainment Weekly, 3 Nov. 2026 If legally dubious, though, such lawsuits may still serve a political purpose. — The New Yorker, New Yorker, 3 Nov. 2026 The possibility that any trace of the original building blocks could still be found was long considered to be dubious at best. — New Atlas, 2 Nov. 2026 Nvidia is the pitiful, helpless giant, now revealed, according to the bears, to have just propped up an ecosystem for its own earnings, with a CEO now revealed to be a dubious character. — Jim Cramer, CNBC, 1 Nov. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

The Dolphins edge suffered a stinger and is questionable to return.

— Miami Herald, Miami Herald, 2 Nov. 2026
Atlanta’s mayor recently asked city police to audit their ALPR searches – a process that flagged some possibly questionable uses that are currently under investigation.

— Graham Hurley, CNN Money, 1 Nov. 2026

Definition of questionable

Adjective

Yale’s men, picked third in the Ivy League preseason poll, figure to have strong guard play this season and power conference teams are as ever, reluctant to play the dangerous Bulldogs.

— Dom Amore, Hartford Courant, 1 Nov. 2026
Haitian police officers have complained that the foreign soldiers are reluctant to confront gangs or hold territory taken back from gangs.

— Jacqueline Charles, Miami Herald, 30 Oct. 2026

Definition of reluctant

Adjective

Friedman began her remarks by reminding the audience of von Furstenberg’s unlikely beginning, born in Brussels to a Holocaust survivor.

— Ariel Bielsky, Vogue, 24 Oct. 2026
Dahlia Scheindlin, a veteran pollster who works for left-of-center candidates and parties in Israel, speculated that the number of returning overseas voters was unlikely to be big enough to change the outcome of the election.

— Daniel Brook, New Yorker, 24 Oct. 2026

Definition of unlikely

Adjective

Ivan, the younger son, is doubtful and skeptical of his father, whereas Andrey, the elder, is faithful and trusting—the twin archetypes of man’s relation to the divine.

— Joshua Yaffa, New Yorker, 2 Nov. 2026
He has been joined in recent years by tax-skeptical scholars at the Manhattan Institute and Tax Foundation.

— M. Nolan Gray, Washington Post, 2 Nov. 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

That was true in its yeshiva reform efforts when hesitant and understaffed local districts were charged with investigations and, even when violations were substantiated, the schools couldn’t be closed down.

— David Bloomfield, New York Daily News, 1 Nov. 2026
For the first time, in an interview, Benson was hesitant to commit.

— Katie Worth, ProPublica, 30 Oct. 2026

Definition of hesitant

Adjective

Omer Shamir France Fleeing from Khan Younis, award-winning Palestinian photojournalist Mohammed Zaanoun moves his immediate family to safety in Egypt, unsure of what’s to come.

— Georg Szalai, HollywoodReporter, 29 Oct. 2026
DiCamillo said backers of a ballot measure also should be concerned any time support registers below 50%, since voters who are undecided or unsure tend to vote no.

— Seema Mehta, Los Angeles Times, 29 Oct. 2026

Definition of unsure

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dubious

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“Dubious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/dubious. Accessed 6 Nov. 2026.

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Synonyms of dubious

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