Over-strung is an adjective that describes something that is tense, anxious, or overwrought, often to the point of being unmanageable or excessive. Some antonyms for over-strung might include calm, relaxed, composed, serene, tranquil, peaceful, unruffled, easygoing, collected, and laid-back. These words describe a state of being that is free from tension or anxiety, where the mind and body are at ease and able to function more optimally. By embracing a more relaxed and serene attitude, one can reduce stress levels, improve mental clarity and emotional well-being, and enjoy a more fulfilling and contented life.