What is another word for closed book?

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Contexts Something that is difficult or impossible to understand or explain Something that is kept or meant to be kept unknown or unseen by others Noun ▲ Something that is difficult or impossible to understand or explain conundrum puzzle enigma mystery riddle secret puzzlement mystification why head-scratcher problem poser stumper question twister paradox teaser puzzler perplexity tough nut to crack brainteaser stickler dilemma crux charade cryptogram braintwister quandary challenge difficulty abstruseness mindboggler rune cliffhanger rebus bewilderment sixty-four-thousand-dollar question mind-boggler question mark sixty-four dollar question unsolved problem complexity complication intricacy inscrutability subtlety secrecy oracle chiller whodunit occult thriller grabber sphinx inscrutableness brain-teaser mind-twister snarl roun abstrusity maze knotty question koan anybody's guess tough proposition anyone's guess tough one Chinese puzzle obscurity involvement food for thought difficult question vexed question cruncher facer fix how-do-you-do can of worms inextricability obfuscation knotty problem Gordian knot convolution complicacy entanglement web confusion tangle trickiness chaos complexness complicatedness knottiness imbroglio labyrinth toughie awkward problem hard nut to crack inexplicableness mystique tortuousness convolutedness turn twist mess brain-twister difficult proposition magic muddle mesh jungle vagueness mysteriousness net morass mire sophistication incomprehensibility skein reconditeness disarray hardness intricateness depth profundity esotericism awkwardness difficultness elaborateness arcaneness deepness occultness involution involvedness “What happens on the remoter flyspecks in the American archipelago remains largely a closed book.” Noun ▲ Something that is kept or meant to be kept unknown or unseen by others secret confidence confidential matter classified information confidential information private affair privileged information skeleton in cupboard skeleton in the cupboard skeleton in the closet intimacy confidentiality Find more words! 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Words that rhyme with closed book What is the plural of closed book? Use our Synonym Finder Nearby Words closed books closed cadence closed circle closed-circuit television closed-circuit televisions closed compound closed at one end closed around closed a deal closed close-cut close-cropped grass