a. 偷偷掉换的, 冒充的, 想像的, 假的

[法] 伪的, 伪造的, 冒充的

[ adj ]
based primarily on surmise rather than adequate evidence
<adj.all>
theories about the extinction of dinosaurs are still highly conjecturalthe supposed reason for his absence
suppositious reconstructions of dead languages
hypothetical situation

Supposititious \Sup*pos`i*ti"tious\, 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.

2. Suppositional; hypothetical. [R.] --Woodward.
※ -- {Sup*pos`i*ti"tious*ly}, adv. --
{Sup*pos`i*ti"tious*ness}, n.