IPA: //sæŋkˈtɪməni//
KK: /sæŋkˈtɪməni/
Pretending to be morally better or more religious than others, often in a way that is not sincere.
His sanctimony made it hard for others to trust him, as he often judged their actions while ignoring his own faults.
Sanctimony is formed from "sanctus" (meaning holy) and "-mony" (a suffix denoting a state or condition). The word refers to the state of being sanctimonious, or pretending to be morally superior to others, often in a hypocritical manner.
Think of 'holy' ('sanctus') to remember that 'sanctimony' refers to a false sense of moral superiority.