Closed Book Definition

noun
One that cannot be known or understood.
American Heritage

(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.
Wiktionary
Synonyms:
adjective

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

Wiktionary

Other Word Forms of Closed Book

Noun

Singular:
closed book
Plural:
closed-books

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Words Starting With

CCLCLO

Words Ending With

KOKOOK

Unscrambles

closed book

Words Starting With C and Ending With K

Starts With C & Ends With KStarts With CL & Ends With KStarts With C & Ends With OK

Word Length

11 Letter Words11 Letter Words Starting With C11 Letter Words Ending With K