resembling or characteristic of a prophet or prophecy
<adj.all> the high priest's divinatory pronouncement mantic powers a kind of sibylline book with ready and infallible answers to questions
having a secret or hidden meaning
<adj.all> cabalistic symbols engraved in stone cryptic writings thoroughly sibylline in most of his pronouncements
Sibylline \Sib"yl*line\, a. [L. sibyllinus.] Pertaining to the sibyls; uttered, written, or composed by sibyls; like the productions of sibyls.
{Sibylline books}. (a) (Rom. Antiq.) Books or documents of prophecies in verse concerning the fate of the Roman empire, said to have been purchased by Tarquin the Proud from a sibyl. (b) Certain Jewish and early Christian writings purporting to have been prophetic and of sibylline origin. They date from 100 b. c. to a. d. 500.