SUPPOSITITIOUS

Sup‐pos′i‐ti″tious (?), a. [[L. suppositicus. See Supposition.]] 1. 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. 2. Suppositional; hypothetical. Woodward.
— Sup‐pos′i‐ti″tious‐ly, adv. — Sup‐pos′i‐ti″tious‐ness, n.