Synonyms of inconceivable

inconceivable

adjective

ˌin-kən-ˈsē-və-bəl 

as in incredible

too extraordinary or improbable to believe

the formerly inconceivable idea that humans could land on the moon

Synonyms & Similar Words

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

Antonyms & Near Antonyms

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

Example Sentences

Recent Examples of inconceivable

Poland has reportedly been warned by the United States that Moscow might attack – in a limited fashion, perhaps with drones or another form of hybrid warfare, but still in a way that decades ago would have seemed inconceivable. — Nick Paton Walsh, CNN Money, 6 July 2026

This would be inconceivable in other sporting cultures around the world. — Patrick Iversen, New York Times, 6 July 2026

The American players seem eager to embrace what might have seemed inconceivable for a big nation with a relatively shallow pedigree in international soccer. — Jim Vertuno, Chicago Tribune, 20 June 2026

But that now seems inconceivable because three Democrats dropped out. — George Skelton, Mercury News, 1 June 2026