suppositious

adj

1. Spurious; substituted for the genuine, counterfeit; fake.

   “[…] who knowes not how false, how suppositious, the writings and Epistles of the auncient Popes are iustly esteemed?”

   “[…] a hen teaches this language with equal ease to the ducklings, she has hatched from suppositious eggs, and educates as her own offspring […]”

   “[…] unfortunately for you, the real Faber and the suppositious Faber, alias Draycott, were much alike in one respect. They gave way to drinking bouts at regular intervals.”

2. Imaginary; fictitious, pretended to exist.

   “At rehearsals the actor tossed an entirely imaginary cloak about his shoulders as though it were heavy brocade, courteously removed a hat made of air, and seriously set out on a suppositious table a non-existent dinner, after sedulously cooking it on a kitchen range that was a chair.”

3. Hypothetical, based on supposition; conjectural.

   “Near-synonyms: assumed, presumed, presumptive, putative, supposed; apparent, likely”

   “Look, Dr. Lanning, let me present you with a suppositious case. Supposing we had a politician who was interested in defeating a reform candidate at any cost and while investigating his private life came across oddities such as I have just mentioned.”