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

Recently, Rodríguez was photographed in a once-unthinkable meeting with uniformed IDF brass overseeing Israeli rescue efforts in the wake of two powerful earthquakes that have devastated Venezuela’s coastal region. — Larry Luxner, Sun Sentinel, 20 July 2026

Reaching mainstream heights was once unthinkable for this radical, uncompromising act, but Paul sensed new horizons in the recording studio. — Steve Appleford, SPIN, 20 July 2026

Before this day is done, we shall be faced with an unthinkable decision. — Jeff Spry, Space.com, 20 July 2026

This might have been an unthinkable approach to an event held in the States as recently as a couple of decades ago, before the globalization of pop got vast American audiences singing along with hits in languages other than English. — Judy Berman, Time, 19 July 2026