The antonyms for the word "most well-versed" could be "inexperienced," "novice," "ignorant," "unfamiliar," or "unversed." These words describe someone who lacks knowledge or expertise in a particular subject or field. They may need to spend more time learning or gaining experience before they can be considered well-versed. It's important to note that being well-versed in a subject takes time and dedication, and even the most knowledgeable people still have room to learn and grow. So, while someone may not be most well-versed in something, it doesn't mean they can't become knowledgeable and skilled with time and effort.