sibylline in WordNet English dictionary

1. having a secret or hidden meaning
   "cabalistic symbols engraved in stone"; "cryptic writings"; "thoroughly sibylline in most of his pronouncements"- John Gunther
   cabalistic  kabbalistic  qabalistic  cryptic  cryptical  sibylline 
   
2. resembling or characteristic of a prophet or prophecy
   "the high priest's divinatory pronouncement"; "mantic powers"; "a kind of sibylline book with ready and infallible answers to questions"
   divinatory  mantic  sibylline  sibyllic  vatic  vatical