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closed-book

listen to the pronunciation of closed-book
الإنجليزية - التركية
(deyim) esrarengiz şey
(deyim) artık ilginç bir yanı kalmadığı için tartışılmaması gereken geçmişte kalmış bir konu,kapanmış bir konu
(deyim) yabancı şey
(deyim) bilinmeyen şey
(deyim) birinin çok az bildiği bir konu
kapalı kutu
الإنجليزية - الإنجليزية
referring to exams in which external resources such as glossaries, study notes, calculators, etc are prohibited
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.

mystery, unknown, enigma (sometimes said of a mysterious person)
A person or thing that cannot be known or understood; something unfathomable or puzzling