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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Antonyms & Near Antonyms

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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Antonyms & Near Antonyms

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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Antonyms & Near Antonyms

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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 For now, the yen's strength is still holding up, but analysts are doubtful it can be sustained. — Lim Hui Jie, CNBC, 4 Aug. 2026 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 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people's fears and distrust of the federal government.

— ABC News, ABC News, 25 Aug. 2026
Victims’ families and experts are unsure the higher amounts will be enough to get tipsters to come forward, citing people’s fears and distrust of the federal government.

— Sarah Raza, Los Angeles Times, 25 Aug. 2026

Definition of unsure

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 tie-up should help some skeptical investors grow more confident that Salesforce — thanks to troves of proprietary customer data housed within its applications — has a role to play in this new AI world.

— Kevin Stankiewicz, CNBC, 27 Aug. 2026
Price likened his attraction to the format to his early embrace of streaming entertainment back in the days when Hollywood remained skeptical of its staying power.

— Katie Kilkenny, HollywoodReporter, 26 Aug. 2026

Definition of skeptical

Adjective

Overt leaflet and loudspeaker campaigns, which the US military also used during the Gulf War and in Iraq and Afghanistan, were meant to weaken morale and instill fear (to dubious success).

— Harmeet Kaur, CNN Money, 27 Aug. 2026
Though the current protests were sparked by the Kushner’s access to advantages from the Albanian government, the Sazan Island incident was a greater representation of Rama’s many dubious dealings.

— Naomi Tomky, Condé Nast Traveler, 24 Aug. 2026

Definition of dubious

Adjective

That claim is debatable as the original date of construction is unknown.

— Dan Fellner, AZCentral.com, 23 Aug. 2026
Luxury taxes are of debatable worth in sports anyway; in a division where the richest can already spend far more than the rest, imbuing them with even greater resources is antithetical to competitive balance.

— Chris Weatherspoon, New York Times, 21 Aug. 2026

Definition of debatable

Adjective

Luke Halls’ video and projections add another layer of visual unease, allowing screens and technology inside the home to become as suspicious as its shadowy corners.

— Dave Quinn, PEOPLE, 26 Aug. 2026
As Joan Acocella wrote for this magazine, in 2008, a suspicious number of cures happen to include alcohol as a main ingredient.

— Shayla Love, New Yorker, 26 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 1 Sep. 2026.

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