divinatory

1. 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. 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"

"supposititious hypotheses"