Antonyms are words that have opposite meanings. The antonyms for the word "most postulated" could vary depending upon the context in which it is used. However, some possible antonyms for it could be "least likely", "rarely considered", "improbable", "unconjectured" or "little thought-of." These antonyms indicate that something is unlikely to be considered or suggested. For instance, if a hypothesis is "most postulated," it means it is the most widely accepted or commonly believed, whereas its antonyms might denote that it is not accepted or seriously considered, or it is thought to be an unlikely possibility. Using antonyms can help provide a better understanding of the context and the intention behind the text.