the -sa nominalization of 優しい (yasashii, “tender, kind”): kindness, tenderness (as an objective degree or amount)
köken: As a surface analysis, a compound of 優しい (yasashii, “kind, tender”) + さ (sa, noun-forming suffix used with adjectives to express objective degree or amount).
köken: Etymology tree French affableder. Esperanto afabla Latin -ia Latin -itia Italian -ezzabor. Esperanto -eco Esperanto afableco From afabla + -eco.