The antonyms for the word "most operatic" can vary depending on the context of its usage. If it is referring to music or theater performances, antonyms may include "simple," "unadorned," or "minimalistic." If it is referring to someone's behavior or actions, antonyms may include "reserved," "understated," or "subtle." In a general sense, antonyms for "most operatic" can be words such as "muted," "quiet," or "restrained." Ultimately, the antonyms for this phrase depend on the perspective of the speaker and the context in which it is used.