The phrase "is hostile to" implies a strong negative sentiment towards something. There are several synonyms that convey similar meaning, such as "resents", "abhors", "opposes", "vexes", and "rejects". Another way to express hostility could be to use words like "antagonistic", "adversarial", "unfriendly", or "hostile". These words all indicate a powerful sense of animosity towards something or someone. They signify resistance and the desire to push away. It's important to choose the right word when expressing strong emotions, as it can convey significant meaning and shape the tone of a message.