mystery, enigma, secret, closed book(noun)
something that baffles understanding and cannot be explained
"how it got out is a mystery"; "it remains one of nature's secrets"
Synonyms:arcanum, brain-teaser, whodunit, conundrum, riddle, secret, closed book, enigma, mystery, mystery story
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"closed book." Synonyms.net. STANDS4 LLC, 2018. Web. 21 Feb. 2018. <https://www.synonyms.net/synonym/closed book>.
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