sup·pos·i·ti·tious /səˌpɑzəˈtɪʃəs/
  (a.)偷偷掉換的,冒充的,想象的,假的,私生的
  Sup·pos·i·ti·tious a.
  1. Fraudulently substituted for something else; not being what is purports to be; not genuine; spurious; counterfeit; as, a supposititious child; a supposititious writing.
  2. Suppositional; hypothetical. [R.]
  -- Sup*pos*i*ti*tious*ly, adv. -- Sup*pos*i*ti*tious*ness, n.
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  supposititious
       adj : based primarily on surmise rather than adequate evidence;
             "theories about the extinction of dinosaurs are still
             highly conjectural"; "the supposed reason for his
             absence"; "suppositious reconstructions of dead
             languages"; "supposititious hypotheses" [syn: conjectural,
              divinatory, supposed, suppositional, suppositious]