Courtly means polished and dignified, as at a royal court. Courtly manners, a courtly bow, courtly love.
Courtly love is the medieval literary code of devotion to an unattainable lady, and it shaped European ideas of romance for centuries. Applied to a person now it means formally polite in a slightly old-fashioned way, and it is usually a compliment.
1adjectivecourtlyPolished and dignified, as at a royal court.
“He greeted her with a courtly bow and kissed her hand.”
courtly is a quality.
Court plus -ly. Court comes from Latin cohors, an enclosed yard or a retinue.
Middle English
courtly
English, today
courtly
From Middle English courtly, equivalent to court + ly.
Etymology from Wiktionary, CC BY-SA