Expert as in riddle 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 ancient manuscript, covered in cryptic symbols and unknown languages, remained a closed book to modern scholars.
The concept of time dilation in physics remains a closed book for many, even with extensive research and study.
The intricacies of the legal system can be a closed book for those without a background in law, making it challenging to navigate.
The encrypted message was akin to a closed book, challenging cryptographers to unravel its hidden meaning.
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