Most tempered refers to someone who is very calm and regulated in their emotional reactions. Antonyms for most tempered could include words such as hot-headed, impulsive, and reactionary. These words describe people who are quick to anger and act before thinking things through. Additionally, words like irritable, agitated, and restless could also be antonyms for most tempered. These words describe individuals who may be easily annoyed or bothered, and are often unable to maintain a sense of calmness in their demeanor. By understanding the antonyms of most tempered, one can better identify and communicate the different behaviors and traits present in individuals.