Her piousness irritated the neighbors, as she openly criticized others while doing the same things in private.

piousness 是由形容词 pious（虔诚的）加上名词后缀 -ness 构成的名词，表示"虔诚、虔敬"的品质或状态。但在本句中带有贬义，指"表面虔诚但实际虚伪"的行为。