The word "most accented" suggests a high degree of emphasis or stress on a particular sound or syllable in speech. Some antonyms for this term include "unaccented," "unemphasized," "flat," and "monotonic." "Unaccented" refers to the absence of emphasis, while "unemphasized" implies a lack of stress on any particular sound. "Flat" and "monotonic" suggest a lack of variation in tone or inflection, and may indicate a speaker who is not engaging or expressive. Other antonyms for "most accented" might include terms like "quiet," "subdued," "hushed," or "muted.