(adj) based primarily on surmise rather than adequate evidence, Syn. supposed, hypothetic, divinatory, hypothetical, suppositional, supposititious, suppositious, Example:theories about the extinction of dinosaurs are still highly conjectural; the supposed reason for his absence; suppositious reconstructions of dead languages; hypothetical situation
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. [ L. suppositicus. See Supposition. ] 1. Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing. Bacon. [ 1913 Webster ]