Moderate as in puzzler A subject or matter that is not easily understood or remains puzzling. Clear All
4 Example Sentences Showcasing the Meaning of 'Closed Book'
Emily found the ancient poetry forms to be a closed book, struggling to decipher their meanings.
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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