Hopping mad is an expression used to describe extreme anger or fury. There are several antonyms to the phrase, which denote a sense of calm or tranquility. The opposite of hopping mad could be serene, peaceful, tranquil, placid, composed, or relaxed. These words signify a state of being free from agitation, disturbance, or turmoil. Additionally, words such as content, happy, satisfied, or pleased could be antonyms to the phrase, as they denote emotions that are the opposite of anger or frustration. Using antonyms wisely can be an excellent way of expressing your feelings and thoughts more eloquently.