I don’t understand what to do with this
"Star-crossed lovers"<span> is a phrase describing a pair of lovers whose relationship is often thwarted by outside forces. The usage of that term in Romeo and Juliet is foreshadowing for how later in the story, Romeo and Juliet's relationship was thwarted by their feuding parents in multiple ways- for example, the Capulets wanted Juliet to marry another man and stay away from Romeo. </span>
"Vague terror" is terror that has no clear cause; as such, it is all-encompassing.
Usually terror is directly caused by something. For example, someone might have a terror of heights, crowds, or spiders. In these situations, the source of one's terror is clear, and avoiding the trigger (heights, crowds, spiders) is generally easy to do.
If terror were to have a clear source, it could be easily defined (and therefore easily combatted). When terror is vague, however, it cannot be easily defined (and cannot be easily defeated). Therefore, "vague terror" is much worse.