Antonyms for the phrase "on top of the world" can include feeling low, down, or depressed. It can also mean feeling powerless, helpless, or defeated. Instead of feeling confident and accomplished, antonyms can refer to feeling insignificant, unnoticed, or overlooked. The spread of negativity can bring feelings of discouragement, discouragement, and frustration. It can also refer to living in challenging times that bring distress and turmoil. However, it's important to remember that struggling is a part of life, and finding ways to push through negativity is essential.