adjective
1.
Synonyms: incredible 1, incogitable, inconceivable, insupposable, unimaginable, unthinkable
Antonyms: believable, credible
2.
Synonyms: implausible , flimsy, improbable, inconceivable, incredible, thick, thin, unconvincing, unsubstantial, weak
Antonyms: believable, credible