open to question

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arguable adj.
controversial adj.
debatable adj.
mootable adj.
problematical adj.
questionable adj.
suspicious adj.
unresolved adj.
unsubstantiated adj.

ADJECTIVE

arguable

Synonyms

STRONGEST

contentious dubious

WEAK

controversial disputable doubtful moot questionable sub judice uncertain unsure

Antonyms

WEAK

certain untenable

ADJECTIVE

controversial

Synonyms

STRONGEST

contentious disputed dubious questionable

WEAK

arguable argumentative contended contestable controvertible debateable disputable disputatious doubtable doubtful dubitable in dispute litigious moot open to discussion polemical suspect uncertain under discussion

Antonyms

STRONGEST

certain definite sure

WEAK

agreeable incontrovertible peaceful uncontroversial undisputed undoubted unquestionable

ADJECTIVE

debatable

Synonyms

STRONGEST

arguable doubtful dubious moot problematic questionable uncertain

WEAK

between rock and hard place between sixes and sevens betwixt and between bone of contention borderline chancy contestable disputable iffy in dispute mootable problematical the jury's out touch and go undecided unsettled up for discussion

Antonyms

STRONGEST

certain clear decided definite proven resolved settled sure unquestionable

WEAK

inarguable incontrovertible indubious questionable uncontestable undoubted

ADJECTIVE

mootable

Synonyms

WEAK

arguable between rock and hard place between sixes and sevens betwixt and between bone of contention borderline chancy contestable contested disputable doubtful dubious exceptionable iffy in dispute moot problematic problematical questionable the jury's out touch and go uncertain undecided unsettled up for discussion

ADJECTIVE

problematical

Synonyms

WEAK

arguable between rock and hard place between sixes and sevens betwixt and between bone of contention borderline chancy contestable contested disputable doubtful dubious exceptionable iffy in dispute moot mootable problematic questionable the jury's out touch and go uncertain undecided unsettled up for discussion

ADJECTIVE

questionable

Synonyms

STRONGEST

ambiguous arguable controversial debatable dubious problematic suspicious unproven vague

WEAK

apocryphal contingent controvertible cryptic disputable dubitable enigmatic equivocal fishy hard to believe hypothetical iffy indecisive indefinite indeterminate moot mysterious obscure occult open to doubt oracular paradoxical problematical provisional shady suspect unconfirmed undefined under advisement under examination unreliable unsettled

Antonyms

STRONGEST

certain clear definite incontrovertible indubious sure trustworthy trusty undoubted unquestionable

WEAK

indisputable proven

ADJECTIVE

suspicious

Synonyms

STRONGEST

dubious questionable uncertain unsure unusual

WEAK

borderline debatable different disputable doubtable equivocal farfetched funny irregular not kosher open open to doubt out of line overt peculiar phony problematic reaching rings untrue shady shaky suspect too much uncommon won't wash

Antonyms

STRONGEST

certain clear definite secure sure undoubted

WEAK

believable indubious innocent palpable trustworthy trusty unquestionable

ADJECTIVE

unresolved

Synonyms

STRONGEST

moot pending unanswered undecided undetermined unsettled unsolved

WEAK

betwixt and between changing doubtful faltering hesitant hesitating hot-and-cold incomplete indecisive irresolute problematical pussyfooting unconcluded unfinished up in the air vacillating vague waffling

Antonyms

STRONGEST

certain decided definite determined settled sure

WEAK

resolved solved

ADJECTIVE

unsubstantiated

Synonyms

STRONGEST

debatable dubious unsupported

WEAK

arguable controversial disputable doubtful dubitable fishy hard to believe iffy indefinite open to doubt suspect suspicious uncertain unconfirmed uncorroborated

Antonyms

STRONGEST

certain sure

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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open to question

Whether “real-time” access to Trump’s posts can produce a long-time revenue stream is open to question.

From Los Angeles Times ● Jul. 23, 2026

Bigger-ticket categories remain constrained, and the ability of smaller cities to compensate for weakness in the megacities is still very much open to question.

From Barron's ● Nov. 15, 2025

“This compensation should ultimately be paid by the perpetrators, but it is open to question whether they will,” the report said.

From Seattle Times ● Feb. 29, 2024

How well the strategy works is open to question.

From New York Times ● Jan. 18, 2024

But now the autonomy of this interior domain, long regarded as inviolate, is open to question.

From "The Lives of a Cell" by Lewis Thomas

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