Friendliness, n.
The condition or quality of being friendly. Sir P. Sidney.
Shades of meaning
Fernald has no entry of its own for friendliness; he lists it under friendship.
Where he writes about it:
Friendliness is a quality of friendly feeling, without the deep and settled attachment implied in the state of friendship. — from friendship
Comity is mutual kindly courtesy, with care of each other's right, and amity a friendly feeling and relation, not necessarily implying special friendliness; as, the comity of nations, or amity between neighboring countries. — from friendship