One word for a hated person is "enemy".
This word implies a strong feeling of hostility and opposition towards someone. Other words that can be used to describe a hated person include:
- Adversary: A person who actively opposes or fights against another.
- Antagonist: A person who actively opposes or is hostile to someone else.
- Nemesis: A powerful and often unbeatable rival or opponent.
- Foe: An enemy or opponent.
The best word to use will depend on the specific context and the intensity of the hatred being expressed.