While the phrase "most submitted" implies a certain level of popularity or prevalence, there are several antonyms that suggest the opposite. Some possible options include "least submitted," "rarely submitted," "infrequently submitted," or "obscurely submitted." These terms imply that something is not as widely known, recognized, or popular as others, and may therefore be less familiar or accessible to the general public. Alternatively, one could use antonyms that suggest a lower level of quality or merit, such as "poorly submitted," "halfheartedly submitted," or "incompletely submitted." By using these antonyms, one can convey a different tone or perspective on the subject matter at hand.