The phrase 'most eyeopening' refers to anything that is surprising, enlightening, or revealing. Some antonyms for this phrase might include words like dull, uneventful, unremarkable, mundane, or uninspiring. These words describe something that is not particularly captivating or stimulating. Other antonyms could include words like closed-minded, ignorant, or narrow-minded, indicating a resistance to new ideas and perspectives. These antonyms highlight the importance of being open to new experiences, ideas, and perspectives. By being curious and receptive to new information, we can continue to learn and grow, evolving our understanding of the world around us.