The phrase "in doldrums" typically means feeling down, in the dumps, or stagnant. However, there are several antonyms that can be used to express the opposite feeling. Some of these include being upbeat, lively, enthusiastic, motivated, inspired, and energized. When someone is feeling upbeat, they are typically in a positive mindset, feeling hopeful and optimistic about the future. A lively person is full of energy and excited about what's to come, while someone who is enthusiastic is passionate and eager to take on challenges. Similarly, being motivated and inspired means that someone is driven and focused on achieving their goals, and feeling energized means that someone is energized and ready to take on the day.