Expert as in riddle A mystery or enigma, similar to a riddle, that is difficult or impossible to understand or decipher. Clear All
3 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.
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