Moderate as in puzzler A mystery or enigma, similar to a riddle, that is difficult or impossible to understand or decipher. Clear All
4 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.
The detective found the encrypted message to be a closed book until he deciphered the code.
The novel's intricate plot and hidden motives made it a closed book for readers until the final chapters unfolded.
The negotiations between the two countries were a closed book until diplomats unveiled the historic agreement.
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