closed book | Idiomator

Meaning: (idiomatic)A person or thing that cannot be easilyunderstood; someone or somethingincomprehensibleorpuzzling.1906,Mary Cholmondeley,Prisoners:Hercourteous,sedate,inexorablehusband, whosewillshe could notbend, whom she could notcajole, whose mind was aclosed bookto her — a book which had lain by her hand for three years, which she had never had thecuriosityto open!1962April, R. K. Evans, “The Acceptance Testing of Diesel Locomotives”, inModern Railways, page266:Like the activities of British Railways Research Department, developing, testing and modifying diesel locomotives before their acceptance for service is another behind-the-scenes activity which is aclosed bookto most passengers and to many railwaymen.

Examples:

EN: Meanwhile, Anna, her past still a closed book, has become a beloved member of the household.
ES: Con el tiempo, Anna, cuya vida seguía siendo un misterio, se había convertido en un miembro más de la casa.
EN: With me it's a closed book.
ES: Conmigo es como un libro cerrado.
EN: Last night's a closed book.
ES: Lo de anoche ya pasó.
EN: My wife was compelled by the exigencies of fortune to exhibit herself on the public stage, but I have chosen to consider her past life a closed book, and to devote myself, as perhaps the foremost of my marital obligations,
ES: Pero he decidido considerar su pasado como un libro en blanco. E imponerme como primera y principal de mis obligaciones maritales, la de su total reeducación.
EN: I could lay no plan for disposing of him as the life he led within those great stone walls was a closed book to me.
ES: No podía trazar un plan para librarme de él... pues la vida que llevaba tras los grandes muros de piedra era un libro cerrado para mí.
EN: It's a closed book.
ES: El caso está cerrado.
EN: No. The past is a closed book.
ES: Con una nueva oportunidad, repetimos los mismos errores.
EN: I'm a closed book!
ES: Mi secreto está oculto en mí.
EN: Well, Max, the case of the disappearing CONTROL agents is a closed book, thanks to you.
ES: Bueno, Max, el caso de los agentes desaparecidos de CONTROL... - ... es caso cerrado, gracias a ti.
EN: With this perspective, the circular motion around a center disappears, as well as the movement of corral rocks attacking birds, transforming them in their glides to the depths into a closed book, although the stories continue.
ES: También desaparece el movimiento circular alrededor de un centro. Yel movimiento del coral, los pájaros, las metamorfosis. Abajo, un libro cerrado.
EN: Your life's no closed book.
ES: Tu vida no es un libro cerrado.
EN: Harry Grey doesn't exist anymore, and the Lotto Murders are a closed book.
ES: Harry Grey ya no existe, y los Asesinatos de la Loto son un caso cerrado.
EN: - Hotels are a closed book to me.
ES: - No conozco ningún hotel.
EN: That's a closed book, Brenda.
ES: Ese es un tema cerrado, Brenda.
EN: Like a closed book.
ES: Como un libro cerrado.

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