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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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 much of last year, Head Start, the federal program that provides child-care and preschool services for low-income families, appeared to have a doubtful future. — Jessica Winter, New Yorker, 20 Aug. 2026 Even if the limb could be spared, its future usefulness was doubtful. — Jeff Murray, Outdoor Life, 20 Aug. 2026 Third-round pick linebacker Jaishawn Barham is doubtful to play with a groin injury that has kept him out of practice over the past week. — Nick Harris, Fort Worth Star-Telegram, 14 Aug. 2026 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 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

Researchers are also still unsure which spacecraft burn up completely and how many fragments may reach the ground, putting lives and property at risk.

— Tereza Pultarova, Space.com, 8 Sep. 2026
Police and lifeguards were unsure as to the most recent jumping fatality, with one official pointing to the 2019 death of 15-year-old Anthony Womack, a National City resident.

— Andrew J. Campa, Los Angeles Times, 8 Sep. 2026

Definition of unsure

Adjective

Banks are happy to oblige, issuing loans and credit with high interest rates to low-income individuals with questionable credit ratings, which increases the likelihood of loan defaults and bankruptcies.

— Eric Khant, Sun Sentinel, 8 Sep. 2026
Senior wide receiver Jordan Dwyer remains questionable, while senior edge rusher Zach Chapman was ruled out by head coach Sonny Dykes on Tuesday.

— Steven Johnson, Fort Worth Star-Telegram, 8 Sep. 2026

Definition of questionable

Adjective

The rationale being that Frank Lampard got his tactics spot on at the Etihad and on another day – a day when Coventry were more decisive in front of goal – their head coach would have been celebrating an unlikely result.

— Stuart James, New York Times, 8 Sep. 2026
Chris Douglas, a professor of economics at the University of Michigan-Flint, called it unlikely that stick prices will go up 50% across the board, noting Canada's modest market share, but wonders what will happen if demand increases.

— ABC News, ABC News, 7 Sep. 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

Initially skeptical of the tub, her contractors took pride in the end result.

— Sean Santiago, Architectural Digest, 9 Sep. 2026
El Sayed has been skeptical of AI throughout his Senate campaign against GOP candidate Mike Rogers, calling for government ownership of the technology and backing a sweeping tax on AI companies’ stock.

— Emily Hallas, The Washington Examiner, 9 Sep. 2026

Definition of skeptical

Adjective

The sleek, gold-colored coupé impressed with a futuristic design, but baffled onlookers with its cramped two-seat interior, lack of a charging port, and a dubious, far-too-good-to-be-true $30,000 price tag.

— Victor Tangermann, Futurism, 10 Sep. 2026
Even then, a dubious penalty and lax marking at a throw were the difference and subs may have felt like a knee-jerk reaction.

— Beren Cross, New York Times, 10 Sep. 2026

Definition of dubious

Adjective

Whether to call these records constitutions is debatable; some are more like treaties; others are more like criminal codes.

— Literary Hub, Literary Hub, 10 Sep. 2026
Kyle Ross / Imagn Images First there was Bohm doubling back — a debatable decision, certainly, with a strong center fielder and a ball hit toward one of the trickiest parts of Citizens Bank Park.

— Charlotte Varnes, New York Times, 9 Sep. 2026

Definition of debatable

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“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 15 Sep. 2026.

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