The term "most novel" means the most original or new, suggesting a high level of creativity and uniqueness. In contrast, one antonym for "most novel" is "most conventional," which means the most traditional or typical, suggesting a lack of innovation. Another antonym could be "most derivative," meaning the most imitative or unoriginal. "Most common" is another antonym that implies a lack of uniqueness or originality. "Most ordinary" or "most routine" are synonyms that suggest a lack of creativity or uniqueness. These antonyms highlight the importance of originality and creativity in various fields, including literature, science, and art.