closed books

A form of closed book — A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.

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Meanings

noun
  1. pluralplural of closed book
Cite this entry
APA

closed books. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/closed%20books

MLA

“closed books.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/closed%20books. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “closed books,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/closed%20books.

Source: closed books on Wiktionary, CC BY-SA 4.0.