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 Jimmy sounds doubtful that Carmy will agree to it. — Jen Chaney, Vulture, 26 June 2026 When that is doubtful, buy your own ticket and leave them to buy theirs. — Judith Martin, Mercury News, 25 June 2026 But his character, who continues to hide the fact that he's been receiving Jill's voicemails from her and is doubtful of the existence of true love, could have gone completely sideways, writer and director Leah McKendrick tells PEOPLE. — Rebecca Aizin, PEOPLE, 24 June 2026 Three centuries later, the librarians of Alexandria took charge of the text, collating competing versions, marking doubtful lines, imposing a measure of order on the teeming verses. — David Denby, New Yorker, 21 June 2026 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

Given his long absence from public view, analysts are unsure whether Khamanei is indeed the architect of the new set-up.

— Tim Lister, CNN Money, 11 Aug. 2026
Pundits are unsure whether Minnesota will yield a similar result.

— Jay Stahl, USA Today, 11 Aug. 2026

Definition of unsure

Adjective

His shows were cancelled for what writers for Ynet and Haaretz considered questionable reasons, among them alleged pressure from Netanyahu’s allies, although the networks involved named other justifications, including financial ones.

— Bernard Avishai, New Yorker, 11 Aug. 2026
Those who witness dangerous or questionable behavior on the water are told to call the NOAA Fisheries’ Enforcement Hotline at 800-853-1964.

— Rick Sobey, Boston Herald, 10 Aug. 2026

Definition of questionable

Adjective

Tottenham Hotspur’s Lucas Bergvall has also featured during discussions, but Newcastle baulked at the asking price and a move for the 20-year-old seems unlikely.

— Chris Waugh, New York Times, 18 Aug. 2026
Simon Baughen, Professor of Shipping Law at Swansea University, said the path toward claiming Hormuz as a US territory was unlikely to come to fruition.

— Hanna Ziady, CNN Money, 18 Aug. 2026

Definition of unlikely

Adjective

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
Speech — Intimidation as censorship The First Amendment protects disputable speech, not agreeable.

— Brielle Miller, Baltimore Sun, 9 Mar. 2026

Definition of disputable

Adjective

That’s mainly because of financial interests and outdated regulations, experts told STAT, which has now left holes in the IRB system where science that is both legally compliant and ethically dubious can proceed.

— Angus Chen, STAT, 11 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

Definition of dubious

Adjective

Maybe someone noticed a person acting suspicious, heard a fight, saw someone leaving the area or remembers a detail that seemed insignificant at the time.

— Simcha Itzkowitz, New York Daily News, 12 Aug. 2026
CyberGuy's guide to protecting yourself from social media scammers includes more ways to evaluate suspicious accounts.

— Kurt Knutsson, FOXNews.com, 12 Aug. 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 18 Aug. 2026.

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Synonyms of doubtful

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