Advanced A subject or matter that is difficult to understand or solve, similar to a conundrum. Clear All
3 Example Sentences Showcasing the Meaning of 'Closed Book'
The mysterious ancient artifact proved to be a closed book, confounding even the seasoned archaeologists.
Understanding the legal jargon in the contract was like reading a closed book for the ordinary citizen.
The complexities of diplomatic negotiations can be a closed book for those unfamiliar with international relations.
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