Advanced as in riddle A subject or matter that is not easily understood or remains puzzling. Clear All
3 Example Sentences Showcasing the Meaning of 'Closed Book'
Despite countless attempts, the alien technology was a closed book to Earth scientists, leaving them puzzled and intrigued.
The encrypted message proved to be a closed book for the codebreakers, requiring exceptional skills to decipher its meaning.
Despite the professor's efforts to simplify the economic theory, it remained a closed book for the majority of the students.
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