Superlative form of saintly: most saintly.(adjective)
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Use "saintliest" in a sentence
"Pontificating to a group of people you don't know is always a little rude, but pontificating on a topic where many of them know vastly more than you do, and getting really basic things wrong, would try the patience of the saintliest moderator i.e. abi."
"I suppose I meant "welcome" in the same sense that God welcomes all of us, the saintliest to the most unrepentant, to better know him."
"I've sworn truth out of England myself all too often, and seen the saintliest specimens lie themselves black and blue for the unlikeliest reasons."