Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
source: Webster 1913
adjective satellite
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.
