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Adjective: sibylline  'si-bu,lIn or 'si-bu,leen
  1. Resembling or characteristic of a prophet or prophecy
    "a kind of sibylline book with ready and infallible answers to questions";
    - divinatory, mantic, sibyllic, vatic, vatical
  2. Having a secret or hidden meaning
    "thoroughly sibylline in most of his pronouncements";
    - cabalistic, kabbalistic, qabalistic, cryptic, cryptical, cabbalistic

See also: esoteric, prophetic, prophetical

Encyclopedia: Sibylline