1) Divinatory 2) Supposed 3) Suppositional 4) Suppositious 5) Supposititious 6) Theoretic 7) Theoretical 1) Hypothetical 2) Iffy 3) Suppositional 4) Suppositious 5) Supposititious 6) Theoretic 7) Theoretical 
• (a.) Dependent on conjecture; fancied; imagined; guessed at; undetermined; doubtful.
Con·jec'tur·al adjective [ Latin conjecturalis : confer French conjectural .] Dependent on conjecture; fancied; imagined; guessed at; undetermined; doubtful. « And mak'st conjectural fears to come into me. Shak. » « A slight expense of conjectural
[adj] - based primarily on surmise rather than adequate evidence
divinatory adjective 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`; `hypothe...
of, of the nature of, or involving conjecture; problematical: Theories about the extinction of dinosaurs are highly conjectural. · given to making conjectures: a conjectural thinker.