IPA: /ˌpaɪəˈtɪstɪk/
KK: /ˈpaɪəˌtɪstɪk/
Relating to a movement in Christianity that emphasizes personal faith and devotion, often seen as overly emotional or affected in its expression of religion.
His pietistic views often led him to express his faith in very emotional ways.
Pietistic → It is formed from "pietas" (from Latin, meaning piety or devotion) and the suffix "-istic" (meaning pertaining to or characteristic of). The word "pietistic" refers to something that is characteristic of or related to piety or devoutness.
Think of 'piety' ('pietas') which relates to deep devotion, and remember that 'pietistic' describes something that embodies that devotion.