adjective
1.
impossible to comprehend in the absence of actual experience or knowledge
color is inconceivable to those born blind
Synonyms: incomprehensible, unimaginable, unknowable, ununderstandable
Idioms: beyond one's grasp
Contrasted words: comprehensible, imaginable, knowable, understandable
Antonyms: conceivable
2.
Synonyms: incredible 1, incogitable, insupposable, unbelievable, unimaginable, unthinkable
Antonyms: conceivable
3.
Synonyms: implausible , flimsy, improbable, incredible, thin, unbelievable, unconceivable, unconvincing, unsubstantial, weak
Contrasted words: believable, convincing, credible, plausible
Antonyms: conceivable