Which word describes a state of strong dislike or ill will?

The word that describes a state of strong dislike or ill will is "animosity." This term specifically conveys feelings of hostility or resentment towards someone or something. It captures the intensity of negative feelings, making it distinct from other terms that might convey different nuances. For example, while "arrogance" refers to an attitude of superiority and haughtiness, it doesn’t relate to dislike or ill will. "Apprehensive" reflects a feeling of anxiety or unease about a future event, unrelated to dislike. "Apathetic" indicates a lack of interest or concern, which does not encapsulate the strong negative emotions embodied in animosity. Thus, "animosity" is the most appropriate term here, as it directly aligns with the definition of having strong dislike or ill will towards someone or something.