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closed book

noun

something that is not known or cannot be understood; a mystery or puzzle.
Abstract art is a closed book as far as I'm concerned.

closed book

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First recorded in 1910–15

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Examples have not been reviewed.

Given founding members of the competition could not be 'relegated' from it, critics argued the tournament was a closed book for Europe's elite teams.

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Mr Ba may have been on the political scene for the last decade, but he is a bit of a closed book for most.

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“As you know, I’m not normally a closed book on this stuff,” Sean told me.

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When the bank collapsed, her loan was one of thousands sold by the government to so-called "closed book" lenders.

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The answer was always there, tucked away within the brittle pages of that closed book—Papá.

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