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")
conjectural, divinatory, hypothetical, hypothetic, supposed, suppositional, suppositious, supposititious -- (based primarily on surmise rather than adequate evidence; "theories about the extinction of dinosaurs are still highly conjectural"; "the supposed reason for his absence"; "suppositious reconstructions of dead languages"; "hypothetical situation")
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