DOUBTFUL Synonyms: 144 Similar and Opposite Words

Q: How does the adjective 'doubtful' contrast with its synonyms?

Some common synonyms of doubtful are dubious , problematic , and questionable . While all these words mean "not affording assurance of the worth, soundness, or certainty of something," doubtful implies little more than a lack of conviction or certainty. // doubtful about whether I said the right thing

Q: When is 'dubious' a more appropriate choice than 'doubtful'?

The words dubious and doubtful are synonyms, but do differ in nuance. Specifically, dubious stresses suspicion, mistrust, or hesitation. // dubious about the practicality of the scheme

Q: When is it sensible to use 'problematic' instead of 'doubtful'?

While the synonyms problematic and doubtful are close in meaning, 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 would 'questionable' be a good substitute for 'doubtful'?

While in some cases nearly identical to doubtful , questionable may imply no more than the existence of doubt but usually suggests that the suspicions are well-grounded. // a man of questionable honesty

doubtful

adjective

ˈdau̇t-fəl

Definition of doubtful

as in unsure

not feeling sure about the truth, wisdom, or trustworthiness of someone or something he was doubtful about the decision to complete the project despite its mounting problems

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as in questionable

giving good reason for being doubted, questioned, or challenged the election results were highly doubtful, so an investigation was begun

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as in unlikely

not likely to be true or to occur our winning the championship increasingly looks like a doubtful outcome

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as in disputable

open to question or dispute a doubtful claim to the property

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How does the adjective doubtful contrast with its synonyms?

Some common synonyms of doubtful are dubious, problematic, and questionable. While all these words mean "not affording assurance of the worth, soundness, or certainty of something," doubtful implies little more than a lack of conviction or certainty.

doubtful about whether I said the right thing

When is dubious a more appropriate choice than doubtful?

The words dubious and doubtful are synonyms, but do differ in nuance. Specifically, dubious stresses suspicion, mistrust, or hesitation.

dubious about the practicality of the scheme

When is it sensible to use problematic instead of doubtful?

While the synonyms problematic and doubtful are close in meaning, problematic applies especially to things whose existence, meaning, fulfillment, or realization is highly uncertain.

whether the project will ever be finished is problematic

When would questionable be a good substitute for doubtful?

While in some cases nearly identical to doubtful, 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 doubtful Aaron Judge appears doubtful for the Wild Card Series because of a calf injury. — ABC News, 27 Sep. 2026 Dunn is doubtful efforts to disparage Nixon’s attachment to DSA will work, noting that doing so could lead to greater turnout. — Miami Herald, 25 Sep. 2026 Tagovailoa previously was listed as doubtful, but his pregame designation means the Falcons will roll with Cooper Rush as the starter and Jack Strand as the backup. — AJC.com, 20 Sep. 2026 On campus, many people remain doubtful that Northwestern’s athletics and academic missions are aligned, especially as football becomes more and more of a business sheltered by a university. — Geraldo L. Cadava, The Atlantic, 19 Sep. 2026 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

Tony Hanna, a parent of a Black Bob Elementary School student, said during public comments Thursday night that parents were unsure whether the six schools were the right choice.

— Kendrick Calfee, Kansas City Star, 3 Oct. 2026
Patriot batteries are being deployed, but communities are still developing civil-defense plans, leaving some residents unsure where to take shelter.

— Claudia Ciobanu, Los Angeles Times, 29 Sep. 2026

Definition of unsure

Adjective

That’s the only real update beyond what has already been announced, including cornerback Xavier Lucas still being out after initially being deemed questionable earlier in the week.

— Jordan McPherson, Miami Herald, 4 Oct. 2026
Rob Blanchard, spokesman for Lamont’s reelection campaign, countered Wednesday that Fazio recently proposed a questionable income tax-cutting plan that could weaken the state’s strong financial reputation.

— Keith M. Phaneuf, Hartford Courant, 4 Oct. 2026

Definition of questionable

Adjective

The political situation in the United States may have made the prospect of an American pope seem even more unlikely.

— Scott Detrow, NPR, 3 Oct. 2026
The Justice Department argued the outlets are unlikely to succeed on their claims and urged Kelly to deny their request for a preliminary injunction.

— Rena Rowe, The Washington Examiner, 3 Oct. 2026

Definition of unlikely

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

The pledge from Walmart comes as concerns are mounting from some shoppers, consumer advocates and lawmakers skeptical about the rollout of digital price labels by the discounter and other stores.

— Anne D’Innocenzio, Los Angeles Times, 28 Sep. 2026
Gary Marcus, a cognitive scientist known for his research on the intersection of psychology and AI, is also skeptical that AI agents could paralyze the internet.

— Megan Cerullo, CBS News, 28 Sep. 2026

Definition of skeptical

Adjective

In the latest dubious milestone for US Treasuries, the yield on the 10-year benchmark note just hit its highest level since the dot-com bust.

— David Goldman, CNN Money, 1 Oct. 2026
Some have done so, the prosecutor explained, by slow-walking directives of dubious merit, such as orders to investigate voter fraud by noncitizens—a phenomenon that Trump has falsely claimed is rampant.

— Eyal Press, New Yorker, 28 Sep. 2026

Definition of dubious

Adjective

Directed by Li Taige, the film stars Yu Qian as a retiring veteran police officer who discovers suspicious anomalies during an apparently routine theft investigation.

— Naman Ramachandran, Variety, 28 Sep. 2026
Five men were arrested near RAF Fairford in southwest England on September 27 after police received a report about three suspicious vans heading toward the air base.

— Sujita Sinha, Interesting Engineering, 28 Sep. 2026

Definition of suspicious

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doubters

doubtful

doubtfully

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“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 5 Oct. 2026.

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