The antonyms for the word "un-friendlinesses" include warmth, cordiality, kindness, affability, amiability, geniality, congeniality, conviviality, sociability, and hospitality. These words denote the opposite of hostility, unfriendliness, or coldness towards someone. When we are friendly towards others, we create an atmosphere of trust and goodwill that can help build strong relationships. Being cordial, kind, and hospitable can make people feel comfortable, respected, and appreciated. In contrast, unfriendliness can create tension, conflict, and an uncomfortable environment. Therefore, it is important to cultivate and practice these antonyms for "un-friendlinesses" to build a harmonious and pleasant social life.