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 As for other returnees to Basic Instinct, Eszterhas was doubtful that Paul Verhoeven would return to direct, but expressed his hope that the filmmaker would come aboard. — Shania Russell, Entertainment Weekly, 14 July 2026 Small Wages, bitter cold, long months of complete darkness, constant danger, safe return doubtful. — Adam Crafton, New York Times, 4 July 2026 Reece James and Jarell Quansah are both doubtful due to injury, and Tino Livramento is out of the tournament entirely. — Christopher Harris, CBS News, 1 July 2026 Jimmy sounds doubtful that Carmy will agree to it. — Jen Chaney, Vulture, 26 June 2026 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

The titular gang comprises Mac (McElhenney), a closeted wannabe tough guy; the narcissistic prepster Dennis (Glenn Howerton); Dennis’s chronically unsure fraternal twin, Dee (Kaitlin Olson); and the bar’s buffoonish janitor, Charlie (Charlie Day).

— Paula Mejía, New Yorker, 17 Aug. 2026
Still, stakeholders are unsure what effects a veto override will have.

— Laura Horne, Charlotte Observer, 17 Aug. 2026

Definition of unsure

Adjective

Stokes was off the injury report as of Monday, and Salaün was listed as questionable but looked to be a full participant in practice on Monday morning.

— Christian Babcock, Mercury News, 18 Aug. 2026
Forcing fans to cover XX-XY shirts wasn't merely a questionable judgment call.

— Alejandro Avila OutKick, FOXNews.com, 17 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

Lots of teams will forfeit games because of an ineligible player (barring athletic directors being skeptical of every transfer).

— Eric Sondheimer, Los Angeles Times, 19 Aug. 2026
He's been skeptical of the war, but he's came out recently and said that the war should end.

— Dana Taylor, USA Today, 19 Aug. 2026

Definition of skeptical

Adjective

SpaceX now has the dubious honor of being the first company to deface the moon, after a piece of one of its rockets crashed into Earth’s only natural satellite earlier this month.

— Andrew Paul, Popular Science, 19 Aug. 2026
HoverAir, an imprint of China's Zero Zero Robotics, has the dubious honor of being the first victim of the FCC's foreign drone ban.

— Jim Fisher, PC Magazine, 18 Aug. 2026

Definition of dubious

Adjective

The person asked for gas money and Bitcoin, requests the family found suspicious because Goods doesn't drive and didn't have a car in Las Vegas.

— Stephen Sorace, FOXNews.com, 19 Aug. 2026
The suspicious em dash—and the easily disprovable notion that only AI used them—was offered as a telltale sign.

— M. C. Mah, Literary Hub, 19 Aug. 2026

Definition of suspicious

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doubtful

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“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 23 Aug. 2026.

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