The phrase "be versed" has several antonyms that describe a lack of knowledge or familiarity with a particular subject. One such antonym is "ignorant," which suggests a complete lack of understanding or knowledge. Another antonym is "inexperienced," which denotes a lack of practical knowledge or familiarity with a particular field or subject. "Uninformed" is another antonym, indicating a lack of access to the necessary information or data. Additionally, "novice" suggests a beginner or someone with only a basic understanding of a subject. Finally, "uneducated" denotes a lack of formal training or education on a specific topic or subject matter.