Closed-book meaning

One that cannot be known or understood.
noun
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(idiomatic) A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.

"Her courteous, sedate, inexorable husband, whose will she could not bend, whom she could not cajole, whose mind was a closed book to her "” a book which had lain by her hand for three years, which she had never had the curiosity to open!" "” Prisoners by Mary Cholmondeley.

noun
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Referring to exams in which external resources such as glossaries, study notes, calculators, etc are prohibited.
adjective
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