Definition of sibylline:
hypothetical, supposed, qabalistic, foresight, inscrutable, deep, augural, vatical, oracular, fatidic, visionary, sibyllic, mystifying, divinitory, kabbalistic, suppositional, esoteric, fatidical, divinatory, mysterious, cryptic, conjectural, vaticinal, cryptical, prophetic, vatic, prophetical, hypothetic, cabalistic, mantic, suppositious, supposititious.
- "Sally Dows and Other Stories", Bret Harte.
- "Kenelm Chillingly, Complete", Edward Bulwer-Lytton.
What a strange figure she made against this strange background, with her quiet, chilly, self- contained manner, her pale face, so sad and worn, her black, straight brows and solemn grey eyes, so inscrutable, mysterious, Sibylline.- "The Vanishing Man", R. Austin Freeman.