Antonyms of the word "most declarative" can include phrases like "least assertive" or "most uncertain". These terms indicate the opposite of what is strongly stated or asserted, suggesting a lack of confidence or conviction. Words like "ambiguous" or "obscure" can also be used as antonyms, indicating a lack of clarity or definitive meaning. Similarly, phrases like "evasive" or "non-committal" can suggest an unwillingness to clearly state a position or make a definitive statement. Depending on the context, other antonyms might include "equivocal", "vague", "tentative", "hazy", "indeterminate", or "unsure".