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

Synonyms & Similar Words

Relevance

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

Synonyms & Similar Words

Antonyms & Near Antonyms

as in unlikely

not likely to be true or to occur our winning the championship increasingly looks like a doubtful outcome

Synonyms & Similar Words

Antonyms & Near Antonyms

as in disputable

open to question or dispute a doubtful claim to the property

Synonyms & Similar Words

Antonyms & Near Antonyms

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

While there have been repatriation flights organized for South Africans, the couple did not pursue that avenue, being unsure of whether the government could — or would — assist in evacuating two citizens who live outside outside the country.

— Blane Bachelor, CNN Money, 14 Mar. 2026
Staff were unsure what food items on the steam table line were on time control.

— Sacbee.com, Sacbee.com, 13 Mar. 2026

Definition of unsure

Browse Nearby Words

doubters

doubtful

doubtfully

See all Nearby Words

Cite this Entry

Style

“Doubtful.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/doubtful. Accessed 19 Mar. 2026.

Copy Citation

Last Updated: 19 Mar 2026 - Updated example sentences

Synonyms of doubtful

adjective

Synonym Chooser

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster on doubtful

More from Merriam-Webster

Word of the Day

nadir

Popular in Grammar & Usage

5 Verbal Slip Ups and Language Mistakes

What does 'etcetera' mean?

Is it 'nerve-racking' or 'nerve-wracking'?

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

The Opposite of Déjà Vu

Why do we say 'fly off the handle'?

Why do we say 'get out of Dodge'?

The Words of the Week - Mar. 13

Why do we call it a 'flea market'?

Popular

5 Verbal Slip Ups and Language Mistakes

The Opposite of Déjà Vu

Why do we say 'fly off the handle'?

Games & Quizzes