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 Census Bureau promoted a dubious report about thousands of noncitizens voting in 2020, an election that the Republican lost to Democrat Joe Biden. — ABC News, 29 Aug. 2026 However, there have been dubious tax cuts, politically motivated earmarks, expanded entitlement programs, and outright waste and overspending in the military. — Chicago Tribune, 28 Aug. 2026 One example is museums’ wall labels now mentioning tainted or dubious provenance. — Devorah Lauter, ARTnews.com, 28 Aug. 2026 Bardem plays Miguel, a celebrated architect tempted by a morally dubious but hugely lucrative commission to build a secret survivalist bunker for a reclusive tech billionaire, Andrew (Paul Dano). — Elsa Keslassy, Variety, 27 Aug. 2026 See All Example Sentences for dubious

Recent Examples of Synonyms for dubious

Adjective

Banks are happy to oblige, issuing loans and credit with high interest rates to low-income individuals with questionable credit ratings, which increases the likelihood of loan defaults and bankruptcies.

— Eric Khant, Sun Sentinel, 8 Sep. 2026
Senior wide receiver Jordan Dwyer remains questionable, while senior edge rusher Zach Chapman was ruled out by head coach Sonny Dykes on Tuesday.

— Steven Johnson, Fort Worth Star-Telegram, 8 Sep. 2026

Definition of questionable

Adjective

The rationale being that Frank Lampard got his tactics spot on at the Etihad and on another day – a day when Coventry were more decisive in front of goal – their head coach would have been celebrating an unlikely result.

— Stuart James, New York Times, 8 Sep. 2026
Chris Douglas, a professor of economics at the University of Michigan-Flint, called it unlikely that stick prices will go up 50% across the board, noting Canada's modest market share, but wonders what will happen if demand increases.

— ABC News, ABC News, 7 Sep. 2026

Definition of unlikely

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

Researchers are also still unsure which spacecraft burn up completely and how many fragments may reach the ground, putting lives and property at risk.

— Tereza Pultarova, Space.com, 8 Sep. 2026
Police and lifeguards were unsure as to the most recent jumping fatality, with one official pointing to the 2019 death of 15-year-old Anthony Womack, a National City resident.

— Andrew J. Campa, Los Angeles Times, 8 Sep. 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 9 Sep. 2026.

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