gentilesse
Courtesy, refinement; gentleness.
literary
[…] nor loved he less / Stately lords in palaces, / Princely women hard to please, / Fenced by form and ceremony, / Decked by courtly rites and dress / And etiquette of gentilesse.
Where it comes from
From Middle English gentilesse, from Old French gentilesce.
Adapted from the Wiktionary entry gentilesse (CC BY-SA 4.0).