The Collaborative International Dictionary of English v.0.48:

Scepsis \Scep"sis\, n. [NL., from Gr. ? doubt, fr. ? to
   consider: cf. G. skepsis. See Skeptic.]
   Skepticism; skeptical philosophy. [R.]
   [1913 Webster]

         Among their products were the system of Locke, the
         scepsis of Hume, the critical philosophy of Kant. --J.
                                                  Martineau.
   [1913 Webster] Scepter