Synonyms of doubtful

doubtful

adjective

ˈdau̇t-fəl 

1

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

• unsure
• skeptical
• suspicious
• uncertain
• dubious
• unsettled
• unconvinced
• undecided
• distrustful
• mistrustful
• hesitant
• on the fence
• ambivalent
• trustless
• conflicted
• hinky
• equivocal
• irresolute
• diffident
• insecure
• indecisive
• wavering
• vacillating
• halting

Antonyms & Near Antonyms

• sure
• certain
• positive
• convinced
• confident
• assured
• sanguine
• decisive
• determined
• resolute
• self-assured

2

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

• questionable
• dubious
• disputable
• suspicious
• debatable
• problematic
• suspect
• shaky
• ambiguous
• unclear
• equivocal
• fishy
• alleged
• queer
• unlikely
• doubtable
• dubitable
• shady
• dodgy
• uncertain
• weak
• moot
• supposed
• improbable
• undetermined
• undecided
• flimsy
• so-called
• far-fetched
• open

Antonyms & Near Antonyms

• sure
• certain
• unquestionable
• indisputable
• undeniable
• undoubted
• indubitable
• unproblematic
• incontestable
• decisive
• definitive
• obvious
• questionless
• positive
• clear
• hands-down
• open-and-shut

3

as in unlikely

not likely to be true or to occur

our winning the championship increasingly looks like a doubtful outcome

Synonyms & Similar Words

• unlikely
• questionable
• dubious
• improbable
• odd
• flimsy
• impossible
• far-fetched
• bizarre
• unapt
• implausible
• inconceivable
• incredible
• unbelievable
• unthinkable
• ridiculous
• unimaginable
• absurd
• foolish
• fantastic
• unreal
• outlandish
• preposterous
• insane
• nonsensical
• crazy
• slight
• outside
• remote
• wild

Antonyms & Near Antonyms

• probable
• likely
• possible
• plausible
• conceivable
• potential
• credible
• earthly
• liable
• believable
• imaginable

4

as in disputable

open to question or dispute

a doubtful claim to the property

Synonyms & Similar Words

• questionable
• disputable
• debatable
• arguable
• moot
• disputed
• controversial
• negotiable
• ambiguous
• uncertain
• controvertible
• doubtable
• issuable
• debated
• speculative
• problematic
• iffy
• inconclusive
• hypothetical
• dubious
• shaky
• theoretical
• refutable
• indecisive
• contradictable
• equivocal
• academic

Antonyms & Near Antonyms

• sure
• certain
• positive
• unquestionable
• indisputable
• undeniable
• unanswerable
• indubitable
• incontestable
• accomplished
• incontrovertible
• settled
• irrefragable
• unchallengeable
• unarguable
• definite
• irrefutable
• undebatable
• inarguable
• unequivocal
• questionless
• conclusive
• unambiguous
• decisive
• clear
• hands-down
• absolute
• undisputed
• uncontested

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

Recent Examples of doubtful

Dominik Szoboszlai and Victor Munoz, however, both remain doubtful for the visit of Chelsea. — Andy Jones, New York Times, 27 Oct. 2026

Whether growth alone can actually solve the federal debt is doubtful. — Marco Quiroz-Gutierrez, Fortune, 16 Oct. 2026

Both stocks have rallied in 2026, with Dell up more than 350% and HPE soaring 185%, but analysts at the bank are doubtful the gains can be sustained much longer. — Davis Giangiulio,darla Mercado, Cfp®, CNBC, 14 Oct. 2026

Oregon was without starting safety Aaron Flowers, who was listed as doubtful earlier this week with an undisclosed injury. — ABC News, 10 Oct. 2026