Moderate as in perplexity A mystery or enigma, similar to a riddle, that is difficult or impossible to understand or decipher. Clear All
2 Example Sentences Showcasing the Meaning of 'Closed Book'
Trying to comprehend the complexities of quantum mechanics can make even advanced students feel like they are facing a closed book.
Emily found the ancient poetry forms to be a closed book, struggling to decipher their meanings.
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