closed book

See also: closed-book

English

Pronunciation
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Noun

closed book (plural closed books)

  1. (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

Antonyms

See also
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