"sibylline" in the adjective sense
1. divinatory, mantic, sibylline, sibyllic, vatic, vatical
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"
2. cabalistic, kabbalistic, qabalistic, cryptic, cryptical, sibylline
having a secret or hidden meaning
"cabalistic symbols engraved in stone"
"cryptic writings"
"thoroughly sibylline in most of his pronouncements"- John Gunther
Source: WordNet® (An amazing lexical database of English)
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