My mind, with inconceivable rapidity followed out all the consequences of such a death.
Again my mind, with its former inconceivable rapidity, had exhausted the whole subject of the attack upon my sister, her illness, and her death, before his slow and hesitating speech had formed these words.
There are no more uses of "inconceivable" in the book.
Show samples from other sources
"Unthinkable! Inconceivable! Absurd! He could never be made into marshmallows!"