Synonyms of unthinkable

unthinkable

adjective

ˌən-ˈthiŋ-kə-bəl 

as in incredible

too extraordinary or improbable to believe

to most people it seemed unthinkable that such a gentle man could be guilty of such awful crimes

Synonyms & Similar Words

• incredible
• unlikely
• incredulous
• impossible
• inconceivable
• unimaginable
• unbelievable
• implausible
• absurd
• ridiculous
• unreasonable
• doubtful
• unconceivable
• questionable
• unconvincing
• full of it
• fantastic
• silly
• dubious
• uncompelling
• debatable
• suspect
• hopeless
• suspicious
• disputable
• shaky
• ludicrous
• fishy
• far-fetched
• untenable
• flimsy
• laughable
• comical
• outlandish
• farcical
• preposterous
• indefensible
• dubitable
• dodgy
• doubtable
• risible
• insupportable

Antonyms & Near Antonyms

• conceivable
• possible
• plausible
• thinkable
• imaginable
• convincing
• credible
• believable
• probable
• likely
• creditable
• reasonable
• supposable
• cogitable
• certain
• indisputable
• sure
• unquestionable
• undeniable
• incontestable
• undoubted
• indubitable
• questionless

Example Sentences

Recent Examples of unthinkable

Those women were just called monsters, they were called evil, they were called unthinkable. — Jaha Nailah Avery, Vulture, 11 Sep. 2026

Unprecedented wildfires have plagued France and Spain; hospitals in England are debating the previously unthinkable — installing air conditioners. — Jack Dolan, Los Angeles Times, 10 Sep. 2026

Architecture is the one art, together with dance and theatre, that is unthinkable without space. — Scott Roxborough, HollywoodReporter, 6 Sep. 2026

The possible move, unthinkable for legacy studios but in keeping with exits by businesses in other sectors, has only stiffened opposition to the merger in some corners. — Dade Hayes, Deadline, 20 Aug. 2026