Superlative form of courtly: most courtly.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "courtliest" in a sentence
"In Pennsylvania legal circles, Mr. Amendola is known for attacking the credibility of alleged victims, especially those in sexual-assault cases, even more than most lawyers in such cases—and for doing it all with the courtliest of manners."
"The minuet – among other dances – reigned supreme as the courtliest, most ..."
"These lady nuns must be of patrician lineage and of fortune enough to defray their expense in the convent, which is of the courtliest origin, for it was founded eight hundred years ago by Alfonso VIII. “to expiate his sins and to gratify his queen,” who probably knew of them."