The Collaborative International Dictionary of English v.0.48:

Suspicable \Sus"pi*ca*ble\, a. [L. suspacabilis, fr. suspicari
   to suspect, akin to suspicere. See Suspect, v. t.]
   Liable to suspicion; suspicious. [Obs.]
   [1913 Webster]

         It is a very suspicable business.        --Dr. H. more.
   [1913 Webster]