What is the term for a feeling of ill will or hatred?

The term for a feeling of ill will or hatred is malevolence. Malevolence describes a disposition to deliberately cause harm or to act with malice toward others. This aligns perfectly with the concept of harboring negative sentiments, suggesting a desire for the misfortune of others.

In contrast, kindness refers to a disposition characterized by caring and helpful actions towards others. Empathy involves understanding and sharing the feelings of another person, which is a fundamentally positive emotional response. Curiosity is the desire to learn or know about something, neither of which conveys ill will or hatred. Therefore, malevolence is the only term that accurately captures the sense of hostility illustrated in the question.