sanctimonious

/ˌsæŋk.tɪˈməʊ.ni.əs/

sanctimonious means making a show of being morally better than others, especially hypocritically pious.

sanctimonious is pronounced /ˌsæŋk.tɪˈməʊ.ni.əs/.

Why “sanctimonious” is a great word

Affecting a hypocritical show of exceptional holiness or moral superiority. From Latin *sanctimonia* ("holiness, sanctity") and the English suffix *-ous*, first recorded in English c. 1600 in a disparaging sense, notably in Shakespeare's *Measure for Measure*. Unlike "pious," which suggests sincere devotion, or "self-righteous," which denotes smug conviction, "sanctimonious" is the performance of virtue, not its possession. It is the precisely folded hands that watch for your reaction, the vocal tone of gravely disappointed honey, the public sigh of resignation at others' failings—all forming a carapace of righteousness around a hollow core. The word knows that virtue, when advertised, forfeits itself.

adj

Making a show of being morally better than others, especially hypocritically pious.e.g.“Near-synonyms: smug; see also Thesaurus:arrogant”
Holy, devout.