The word "un-cordiality" refers to the lack of warmth, friendliness, or openheartedness towards someone. Its antonyms include cordiality, affability, friendliness, geniality, warmth, congeniality, kindness, openheartedness, amiability, and hospitality. For instance, cordiality means showing warmth, friendliness, and kindness towards others. Similarly, amicability refers to the quality of being friendly and cooperative. Friendliness denotes being kind, warm, and congenial towards others. Geniality indicates showing a cheerful and friendly disposition. Openheartedness implies being honest and sincere in one's dealings with others. In essence, antonyms for un-cordiality are all about showing warmth, kindness, and friendliness towards others as opposed to coldness and hostility.