The Collaborative International Dictionary of English v.0.48:

Apish \Ap"ish\, a.
   Having the qualities of an ape; prone to imitate in a servile
   manner. Hence: Apelike; fantastically silly; foppish;
   affected; trifling.
   [1913 Webster]

         The apish gallantry of a fantastic boy.  --Sir W.
                                                  Scott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

apish
    adj 1: being or given to servile imitation [syn: apish,
           apelike]