To act as if morally better than other people

Don't give me that holier-than-thou look, I know you did it

Non fare quell'aria da santarellina, so benissimo che sei stata tu

She looks like a goody-goody, but you should see her at parties after a couple of drinks. So much for still water…!

Fa tanto la santarellina, ma dovresti vederla alle feste dopo un paio di bicchierini. Altro che acqua cheta…!

She would play it like she is all virtue and piety, bur she's not! Believe me, I know her very well

Vuol apparire come una santarellina, ma non lo è! Credimi, io la conosco molto bene