Source : Webster's Revised Unabridged Dictionary (1913)

Syncretistic \Syn`cre*tis"tic\, a.
   1. Pertaining to, or characterized by, syncretism; as, a
      syncretistic mixture of the service of Jehovah and the
      worship of idols.

   2. Of or pertaining to Syncretists.

Source : WordNet®

syncretistic
     adj 1: relating to a historical tendency for a language to reduce
            its use of inflections; "modern English is a syncretic
            language" [syn: {syncretic}, {syncretical}, {syncretistical}]
     2: of or characterized by syncretism [syn: {syncretic}, {syncretical},
         {syncretistical}]