The phrase "am on the edge," typically indicates a feeling of being close to a breaking point. The opposite of this state of mind would be to feel stable, balanced, and steady. Synonyms for this feeling might include being centered or grounded, calm or relaxed, or perhaps even content or at ease. Alternatively, someone who is feeling energized and invigorated might be said to be enthusiastic or excited, while someone who feels deeply connected to their surroundings might be referred to as being grounded or rooted. Whatever the antonym, the goal is to find balance and stability, helping to alleviate any feelings of stress or overwhelm.