The opposite of "most life or death" could be understood in several ways. It may mean something that is trivial, insignificant, or unimportant in comparison. Some antonyms could be "insignificant" or "trivial." Alternatively, it could also indicate something that is safe, commonplace, or routine. In this sense, antonyms for "most life or death" could include "everyday," "ordinary," or "normal." Furthermore, if we assume that the phrase emphasizes the importance of a particular situation or decision, then its antonyms may imply uncertainty, indecision, or indifference. These could include "indecisive," "unimportant," or "careless." Ultimately, the choice of antonym for "most life or death" will depend on the context and intended meaning of the phrase.