Advanced as in perplexity 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'
Despite the professor's efforts to simplify the economic theory, it remained a closed book for the majority of the students.
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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