VDict - Definition of closed book

English - English (Wordnet) dictionary (also found in English - Vietnamese, )

closed book

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Noun

something that baffles understanding and cannot be explained
- how it got out is a mystery
- it remains one of nature's secrets

Related words

Synonyms:
mystery enigma secret

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Words contain "closed book" in its definition in English - English (Wordnet) dictionary:
closed closed-circuit transverse flute sedan closed-angle glaucoma see to it shut claustrophobic closed-door spine more...

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