The antonyms of the word "most sheathed" could be "exposed", "unprotected", or "naked". These words describe a situation where something is not covered, hidden or protected in any way, which is the opposite of being sheathed. For example, a chef's knife might be sheathed when not in use, but during cooking, it is exposed and unprotected. Similarly, a building might have a sheathed roof, but during a storm, the roof may become naked or unprotected, leaving the interior exposed to the elements. Understanding antonyms of words like "most sheathed" can help us better comprehend the meaning and usage of words in context.