General Terms:
* Hatred: The most direct and common term.
* Aversion: Strong dislike or disinclination.
* Antipathy: A deep-seated feeling of dislike.
* Animosity: Intense hostility or active dislike.
* Loathing: Intense disgust and hatred.
* Abhorrence: Strong feeling of disgust and hatred.
* Contempt: Feeling that someone or something is worthless or deserving of scorn.
* Scorn: Feeling or showing contempt or disdain.
* Despise: To feel or show intense dislike or contempt for.
* Detestation: Intense hatred or disgust.
More Specific Terms:
* Vengeance: Desire for revenge.
* Bitterness: A feeling of resentment and anger.
* Enmity: A state of deep-seated mutual hostility.
* Malevolence: Wishing harm to others.
* Rancor: Bitter resentment or ill will.
* Spite: A desire to harm or annoy someone.
* Bigotry: Intolerance towards those holding different views.
* Prejudice: Preconceived opinion not based on reason or actual experience.
* Disdain: The feeling that someone or something is unworthy of one's consideration.
* Opprobrium: Public disgrace or reproach.
Abstract Concepts:
* Toxicology: The study of poisons and their effects. (Can be used metaphorically for harmful relationships, etc.)
* Venom: Poisonous or spiteful words or actions.
* Malice: The intention or desire to do evil.
* Vile: Morally wicked or evil.
* Abomination: Something that causes disgust or hatred.
Note: Some of these terms are more intense than others. The best choice will depend on the specific context and the nuances you wish to convey.