Moderate as in puzzler A subject or matter that is difficult to understand or solve, similar to a conundrum. Clear All
4 Example Sentences Showcasing the Meaning of '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.
For the curious teenager, quantum physics remained a closed book, filled with complex equations and abstract concepts.
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