Entry 1 sense Webster, 1913 Pietistic · Pi·e·tis·tic · IPA /paɪ.ɪˈtɪs.tɪk/ 01 a. Of or pertaining to the Pietists; hence, in contempt, affectedly or demonstratively religious. 1. Of or pertaining to the Pietists; hence, in contempt, affectedly or demonstratively religious.