The Collaborative International Dictionary of English v.0.48:

Simious \Sim"i*ous\, a.[L. simia an ape.] (Zool.)
   Of or pertaining to the Simi[ae]; monkeylike.
   [1913 Webster]

         That strange simious, schoolboy passion of giving pain
         to others.                               --Sydney
                                                  Smith.
   [1913 Webster]