Tenderheartednesses, which refers to the quality of being kind, gentle, and sensitive towards others, does not have any direct antonyms. However, words such as callousness, cruelty, harshness, and insensitivity, could be considered antonyms because they constitute the opposite of tenderheartedness. Callousness implies a lack of compassion or empathy, while cruelty refers to deliberate and malicious mistreatment of others. Harshness implies severity, and insensitivity describes a state of being indifferent or unfeeling towards other people's emotions. These antonyms highlight the negative qualities that are incompatible with being tenderhearted, making it easier to understand and appreciate the value of tenderheartedness.