General Synonyms:
* Hostility: This is a very close synonym, implying a strong feeling of opposition and unfriendliness.
* Enmity: This suggests a deep-seated hatred and ill will.
* Aversion: This indicates a strong dislike or repugnance.
* Antipathy: This implies a natural or instinctive aversion or opposition.
* Bitter feeling: This suggests a strong sense of resentment or displeasure.
* Ill will: This refers to a desire to harm or cause harm to another.
* Hate: This is the strongest synonym, implying intense dislike and a desire to see harm befall the object of one's hatred.
More specific synonyms:
* Rancor: This implies bitterness and resentment, especially over a past wrong.
* Vengeance: This suggests a desire for revenge or retribution.
* Spite: This indicates a malicious intent to harm or annoy.
* Malice: This implies a wish to harm or cause suffering to another.
The best synonym to use will depend on the specific context. Consider the strength and nature of the feeling you want to convey.