Sentence:  The rich communal life of the most <WSD>ascetic</WSD> Protestants, for example, the Hutterites and the Old Order Mennonites, with their nineteenth century dress and preference for antiquated technology, refutes such superficial judgments. 
Meaning of the word marked with <WSD> tags:  Characterized by rigorous self-denial or self-discipline; austere; abstinent; involving a withholding of physical pleasure.