The antonyms for the word "most feverous" can be described as words that connote coolness, calmness, and tranquility. The opposite of being feverous is being composed, mild, or peaceful. Antonyms for "most feverous" include phrases such as chilly, cold-blooded, dispassionate, and unemotional. Additionally, adjectives like composed, imperturbable, placid, and relaxed can be used to describe someone who isn't feverous. Being feverous implies that one is extremely agitated and emotional, which is the opposite of those who remain collected and serene. Therefore, antonyms for "most feverous" must refer to qualities that are associated with peace and calmness.