The word "more overstrung" indicates a state of tension, where a person is highly strung or stressed. The antonyms for this phrase could include "calm," "relaxed," "unstrung," "easygoing," or "laid-back." These words denote a state of tranquility or composure, where an individual is not overwhelmed by stress or tension. Being calm and relaxed allows one to be focused, productive and efficient in both personal and professional settings. It is important to take steps to minimize stress and maintain good mental health, such as practicing meditation or mindfulness, getting enough sleep, eating healthily and avoiding high-stress situations.