syncretistic

syncret(ism) +‎ -istic

• IPA^(key): /ˌsɪŋkɹəˈtɪstɪk/

syncretistic (comparative more syncretistic, superlative most syncretistic)

1. Relating to the merging of two ideals, organizations or languages into one.
   • 1995 June 22, Umberto Eco, “Ur-Fascism”, in The New York Review of Books‎, archived from the original on 2017-01-31:

     One has only to look at the syllabus of every fascist movement to find the major traditionalist thinkers. The Nazi gnosis was nourished by traditionalist, syncretistic, occult elements.

2. (linguistics) Relating to a historical tendency for a language (such as English) to reduce its use of inflection.

• syncretism