Antonyms for the phrase "in a tizzy" include "calm," "composed," "relaxed," "serene," and "unruffled." These words signify a state of tranquility and composure, the opposite of being agitated and flustered. Remaining level-headed and collected in stressful situations helps an individual in making well-thought-out decisions and maintaining a positive demeanor. Steadiness and equanimity lead to better results and improve the quality of an individual's life. Therefore, it's important to learn to calm oneself during stressful times and seek antonyms that match the desired state of being. These opposites complement the phrase "in a tizzy" by providing a sense of balance and harmony.