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 Experts, including Higel, are doubtful that the Iraqi government will be able to disarm the Iran-loyal groups even if war between Iran and the US ends. — Sarah Tamimi, CNN Money, 30 Sep. 2026 Backup quarterback Cole Ballard, who was injured in the Missouri game, is likely to be listed as doubtful at best this week. — Gary Bedore, Kansas City Star, 28 Sep. 2026 As far as Dolphins inactives along with wide receiver Caleb Douglas (ankle) and defensive end Rob Beal (hamstring), Wright (stinger/foot) was announced out after entering Sunday doubtful. — David Furones, Sun Sentinel, 27 Sep. 2026 One name not mentioned is star wide receiver Puka Nacua, who is doubtful for Sunday. — Sam Jane, Denver Post, 26 Sep. 2026 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

So fraternities promise that kind of friendship and loyalty, and also for young people, 18-year-olds, many of whom are unsure of themselves, fraternities and sororities say this is the way to be popular.

— Richard Hall, Time, 7 Oct. 2026
The department was unsure of the route the aircraft was trying to take, and the crash started a small grass fire that was quickly doused.

— Matthew Ablon, CBS News, 7 Oct. 2026

Definition of unsure

Adjective

Rain rates are probably going to be a quarter of an inch per hour or less, making debris flow and landslides unlikely.

— Hannah Fry, Los Angeles Times, 10 Oct. 2026
The Times’ belated discovery of Bragg’s malpractice emerged through an unlikely incident that has not been reported in full.

— Charles Bethea, New Yorker, 9 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

In one image, Grande’s Olivia Jones stands beside De Niro’s Byrnes, who wears a decidedly skeptical expression, her hand resting on his German shepherd.

— Alicia Urrea, Billboard, 12 Oct. 2026
Jorge Piñón, an energy researcher at the University of Texas at Austin, is skeptical of the data and noted that only sanctioned Cuban state energy company CUPET has the capacity to store such a large quantity of fuel in one month.

— Nora Gámez Torres, Miami Herald, 12 Oct. 2026

Definition of skeptical

Adjective

If Secretary of Defense Pete Hegseth is to be believed, America will soon gain the dubious distinction of joining the only four countries on the globe that carry out executions in public.

— Lorraine Ali, Los Angeles Times, 10 Oct. 2026
Publicly available information from the Pike case, for instance, suggests that the drug may have been of dubious quality and extravasated during administration by Tennessee prison employees.

— Dr. Jacob Appel, New York Daily News, 8 Oct. 2026

Definition of dubious

Adjective

Whether a 7-inch display is really the ideal way to watch TV is debatable, but for recipes, video calls and background entertainment, the format makes sense.

— New Atlas, New Atlas, 14 Oct. 2026
While the advantages of retinoids like retinol—firmer, clearer, and brighter skin—are essentially fact at this point, what constitutes the best retinoid is a bit more debatable.

— Deanna Pai, Vogue, 7 Oct. 2026

Definition of debatable

Adjective

Strong antivirus software can help detect malicious downloads, suspicious links and other threats that may show up in follow-up scams.

— Kurt Knutsson, FOXNews.com, 12 Oct. 2026
Abby became suspicious of Kuehl during a private conversation about possible traitors in the group.

— Lisa Gutierrez, Kansas City Star, 12 Oct. 2026

Definition of suspicious

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“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 17 Oct. 2026.

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