He wished to discuss the various inferences of Aristotle's 'unbelievable' tale.

Scott immediately returned to his old ways of spreading unbelievable tales about his mine, which Johnson did nothing to discourage, regarding it as merely amusement.

He remembered laughing at the unbelievable tales of a cousin who'd been to Budapest.

It was hardly strange for unbelievable tales to attach to anyone like that.

I am suspicious of your story, my dear lady, because it is a highly unbelievable tale.

Carter wanted to write a Frankenstein-inspired episode, but found it difficult to reconcile Mary Shelley's unbelievable tale with the style of the show.

The story ends with Zachry's child recalling that his father told many unbelievable tales.

No one would be able to bring an otherworldly corpse as evidence of an otherwise unbelievable tale.

It was indeed a remarkable, an amazing, an almost unbelievable tale, which he had to tell.

The bottom line is that the "Necronomicon" is a literary device intended to add a sense of believability and legitimacy to otherwise unbelievable tales.