When someone is "getting into a dither", it means they are becoming anxious, confused, or agitated. However, there are a variety of antonyms that can be used to describe the opposite state of mind. Some possible antonyms for "getting into a dither" include feeling calm, relaxed, composed, collected, tranquil, peaceful, serene, unflappable, easygoing, or laid-back. These words suggest a sense of ease, stability, and peacefulness, and provide a contrast to the frenzied and chaotic emotions associated with being in a dither. By focusing on these more positive emotions, people can find the clarity and inner peace they need to face whatever challenges come their way.