Phrase guide

closed book

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

A person or thing that cannot be easily understood; someone or something incomprehensible or puzzling.

Definition source: English Wiktionary via Wiktextract

Usage: idiomatic

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

something that baffles understanding and cannot be explained

Definition source: Princeton WordNet 3.0

Examples

  • how it got out is a mystery
  • it remains one of nature's secrets

Meaning relationships

Synonyms: mystery, enigma, secret

Antonyms: none provided

Broader terms: perplexity

History

Etymology

No etymology was provided for this word.