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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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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Synonym Chooser

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

Margarita, who studied jewelry design, is unsure whether Princess Margaret would have been a fan of her jewelry preferences.

— Bailey Bujnosek, InStyle, 1 Sep. 2026
For the first ten minutes, the audience seems a little unsure where any of this is going — something Lyons is self-aware enough to address.

— Rebecca Rosman, NPR, 31 Aug. 2026

Definition of unsure

Adjective

Wikus van de Merwe (Sharlto Copley) plays a government agent working in the Department of Alien Affairs, who gets caught up in a world of questionable ethics and violence.

— Grace Dean, Space.com, 1 Sep. 2026
She was recently listed as questionable due to a back injury ahead of a game against the Toronto Tempo, but started both games against the expansion team last week.

— Tracy Brown, Los Angeles Times, 31 Aug. 2026

Definition of questionable

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

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 the unyielding scrutiny over dubious associations doesn’t cut both ways.

— Lorraine Ali, Los Angeles Times, 3 Sep. 2026
When his distant goddaughter Helena (Phoebe Waller-Bridge) shows up with a dubious interest in researching the Dial, Indy is begrudgingly wrangled into One Last Ride.

— Frank DeRuggiero, Entertainment Weekly, 3 Sep. 2026

Definition of dubious

Adjective

Gray Interiors Named Most Controversial Home Trend Topping the list for most controversial design trends is the ever-debatable millennial gray.

— Claire Hoppe Norgaard, Better Homes & Gardens, 31 Aug. 2026
Plain Glossy White and Round Plates This is highly debatable even among our experts.

— Sheila Kim, The Spruce, 30 Aug. 2026

Definition of debatable

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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doubters

doubtful

doubtfully

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

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