divinatory

adjectives

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, sibyllic, sibylline, vatic, vatical
is derived from
divine
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"
conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious, supposititious