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 next

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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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 Smart, who has been the cornerstone of the Lakers’ defensive operation in recent weeks, is doubtful for Thursday’s game against the Bulls with a right hip contusion. —

Benjamin Royer, Oc Register, 11 Mar. 2026 Killing consumer rights There’s reason to be doubtful. —

Orlando Sentinel Editorial Board, The Orlando Sentinel, 10 Mar. 2026 Edwards is doubtful for the Mustangs’ ACC tournament opener against Syracuse on Tuesday afternoon in Charlotte, a team spokesperson told The Dallas Morning News Monday. —

Lia Assimakopoulos, Dallas Morning News, 9 Mar. 2026 Even California decided to rescind and stop issuing CDLs to those whose immigration status is doubtful. —

Simon Hankinson, Boston Herald, 6 Mar. 2026 See All Example Sentences for doubtful

Recent Examples of Synonyms for doubtful

Adjective

The setback will cost taxpayers nearly $1 million pulled from the county’s Office of Homelessness Solutions budget, a financial burden that officials were at one point unsure the county could afford.

— Hannah Elsmore, San Diego Union-Tribune, 20 Mar. 2026
Daghighi is one of the older students in her classes, which initially left her feeling uncomfortable and unsure of herself.

— Jenelyn Russo, Oc Register, 20 Mar. 2026

Definition of unsure

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“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 29 Mar. 2026.

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