a. | 1. | Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; |
2. | Suppositional; hypothetical. |
Adj. | 1. | supposititious - 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" |