hard to believe

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questionable adj.
unsubstantiated adj.

ADJECTIVE

questionable

Synonyms

STRONGEST

ambiguous arguable controversial debatable dubious problematic suspicious unproven vague

WEAK

apocryphal contingent controvertible cryptic disputable dubitable enigmatic equivocal fishy hypothetical iffy indecisive indefinite indeterminate moot mysterious obscure occult open to doubt open to question 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

unsubstantiated

Synonyms

STRONGEST

debatable dubious unsupported

WEAK

arguable controversial disputable doubtful dubitable fishy iffy indefinite open to doubt open to question 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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hard to believe

In the film, it's hard to believe he's so ill.

From BBC ● Oct. 26, 2026

It’s hard to believe that some of television’s finest actors — industry veterans known for iconic shows and critically acclaimed performances — have yet to receive the industry’s highest honor.

From Los Angeles Times ● Sep. 14, 2026

"That again may be really hard to believe but that is exactly what they have just done."

From BBC ● Aug. 19, 2026

He found it especially hard to believe that AI could replicate things that make us human, like intuition and creativity.

From The Wall Street Journal ● Aug. 1, 2026

I find it hard to believe I’m still alive.

From "Dry" by Neal Shusterman and Jarrod Shusterman

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