imperscrutableness

from The Collaborative International Dictionary of English v.0.48

Imperscrutable \Im`per*scru"ta*ble\, a. [L. imperscrutabilis.]
   Not capable of being searched out; inscrutable. [Obs.] --
   {Im`per*scru"ta*ble*ness}, n. [Obs.]
   [1913 Webster]