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Definition of Closed book
1. Noun. Something that baffles understanding and cannot be explained. "It remains one of nature's secrets"
Exact synonyms: Enigma, Mystery, Secret
Generic synonyms: Perplexity
Derivative terms: Enigmatic, Enigmatic, Enigmatical, Mysterious, Mysterious, Mystify, Mystify
Generic synonyms: Perplexity
Derivative terms: Enigmatic, Enigmatic, Enigmatical, Mysterious, Mysterious, Mystify, Mystify