1) Conjectural 2) Divinatory 3) Hypothetical 4) Not genuine 5) Spurious 6) Supposed 7) Suppositional 8) Suppositious 9) Theoretic 10) Theoretical 1) Conjectural 2) Suppositional 3) Suppositious 4) Theoretic 5) Theoretical 
• (a.) Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing. • (a.) Suppositional; hypothetical.
Sup·pos`i·ti'tious adjective [ Latin 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. 2....
(Lat suppositions, put in the place of, substituted) Epistemological expression applying to any object which is assumed or posited by the mind without being actually given by experience. -- L.W.
fraudulently substituted or pretended; spurious; not genuine. · hypothetical.