Advanced as in puzzler A subject or matter that is not easily understood or remains puzzling. Clear All
3 Example Sentences Showcasing the Meaning of 'Closed Book'
Despite the professor's efforts to simplify the economic theory, it remained a closed book for the majority of the students.
Deciphering the intricate legal documents proved to be a closed book for the novice lawyer.
To the amateur astronomer, the vast universe remained a closed book until the powerful telescope revealed its wonders.
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