The word "hard-heartednesses" refers to the lack of emotions or sympathy towards others. Synonyms for this word can include callousness, coldness, cruelty, indifference, insensitivity, unfeelingness, and ruthlessness. Callousness implies a disregard for the feelings of others, while coldness indicates a lack of warmth or empathy. Cruelty denotes a malicious intent to harm others, whereas indifference suggests a lack of concern. Insensitivity indicates an inability to perceive or understand the feelings of others. Unfeelingness refers to a lack of emotional sensitivity, and ruthlessness implies a willingness to be harsh or unrelenting towards others. Each of these synonyms describes a different aspect of the lack of empathy and compassion associated with hard-heartedness.