The Collaborative International Dictionary
Supposititiously
Supposititious \Sup*pos`i*ti"tious\, a. [L. suppositicus. See Supposition.]
Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
--Bacon.Suppositional; hypothetical. [R.]
--Woodward. [1913 Webster] -- Sup*pos`i*ti"tious*ly, adv. -- Sup*pos`i*ti"tious*ness, n.