The antonyms for the word "most pettish" are "calm," "composed," "tranquil," "gracious," and "patient." These words denote opposite meanings to the word "pettish," which describes someone who is easily irritated, cranky, or prone to petty complaints. A calm person, on the other hand, maintains their composure and is less likely to react impulsively or get ruffled by minor incidents. A composed person stays balanced amidst conflict, while a tranquil person is calm and peaceful. Being gracious denotes being kind and courteous, and patience refers to one's ability to wait calmly without getting irritated. These antonyms showcase a positive personality trait, which is essential for maintaining healthy relationships and creating a harmonious environment.