I think you're talking about a participal phrase.
Ex:Awakened by the blaring horns,Aaron looked out the window.
Answer:
The purpose of the veteran parade is to honor those who have served in the military.
Explanation:
Weak: potent
The answer is potent.
Since misery and depression are both sad/bad kinds of feelings, then we have to find a pair of words that have the same kind of feeling in order to complete this analogy. The correct answer should be melancholy and boredom.