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"
doubtful or suspect
"these so-called experts are no help"
- so called
"the supposed existence of ghosts"
required or under orders
"I'm supposed to be there at ten"
"he was supposed to go to the store"