The term BE HOSTILE TO can be summarized by two crossword solutions: OPPOSE (6 letters) and ENEMY (5 letters). To be hostile to someone means to be unfriendly or aggressive towards them. It is often used to describe a relationship between two people, groups, or nations that are in conflict with each other. OPPOSE is a verb meaning to disagree with or resist something, while ENEMY is a noun meaning a person or group that is opposed to another.