The word "cordialness" refers to warmth, friendliness, and geniality in social interactions. Its antonyms, on the other hand, indicate a lack of these qualities. Some common antonyms for cordialness include aloofness, coldness, hostility, unfriendliness, and rudeness. Aloofness implies a distant or standoffish demeanor, while coldness connotes a lack of warmth or emotion. Hostility suggests aggression or antagonism, while unfriendliness indicates a general lack of interest in building relationships. Finally, rudeness implies a lack of consideration for others and can manifest in a variety of negative behaviors. In social situations, it is often beneficial to avoid these antonyms to cultivate positive interactions and strong relationships.