The phrase "out of sorts" is commonly used to describe an individual who is feeling unwell or uncharacteristically off-balance. Antonyms for this phrase would be terms that describe a person who is feeling well, balanced, and content. Some possible antonyms for "out of sorts" include "healthy," "energized," "confident," "content," and "harmonious." Alternatively, one could use positive descriptive terms such as "in fine fettle," "in high spirits," "in top form," or "at ease." By using antonyms or contrasting positive descriptive words, we can quickly and effectively convey the exact opposite of the negative mood implied by the phrase "out of sorts.