Example : I'm supposed to be there at ten.
He was supposed to go to the store.

Example : The supposed existence of ghosts.

Example : These so-called experts are no help.

Synonyms : alleged, so-called

Example : Theories about the extinction of dinosaurs are still highly conjectural.
The supposed reason for his absence.
Suppositious reconstructions of dead languages.
Hypothetical situation.

Synonyms : conjectural, divinatory, hypothetic, hypothetical, suppositional, suppositious, supposititious