Affability is a related term of courteousness.
As nouns the difference between affability and courteousness
is that affability is the state or quality of being affable, friendly, or approachable while courteousness is the characteristic of being courteous.
affability
English
Noun
(affabilities)
The state or quality of being affable, friendly, or approachable.
courteousness
English
Noun
(-)
The characteristic of being courteous.