(derogatory) a tendency to act as though one is morally superior and figuratively holier than others, usually in a way that seems pretentious and/or hypocritical;
e.g. They could hear the sanctimony in her voice, and they knew she didn't believe or practice what she preached.
(noun)
(old) the state or quality of being holy or sacred;
e.g. Your actions disturb the sanctimony of this place of worship.