Most granted means something that is usually taken for granted or assumed to be true without being questioned. Antonyms for the word most granted could vary depending on the context in which it is used. Some possible antonyms for the word most granted are improbable, uncertain, dubious, skeptical, unsure, and disputable. These words denote situations or ideas that are not commonly accepted or are questioned by others. For instance, saying that something is improbable means that it is unlikely or doubtful, while uncertain implies a lack of confidence in the validity of an idea or judgment. Therefore, the opposite of most granted can be any word that suggests a degree of skepticism or doubt.