Đồng nghĩa của a closed book

Danh từ

Something or someone puzzling, mysterious or inexplicable
enigma mystery puzzle conundrum riddle problem paradox teaser head-scratcher mystification puzzlement quandary question secret stumper why bewilderment brain-teaser cliffhanger crux cryptogram grabber knot mind-boggler mind-twister parable perplexity poser puzzler sphinx sticker stickler twister closed book question mark unsolved problem Gordian knot sixty-four dollar question tough nut to crack brainteaser challenge dilemma difficulty abstruseness intricacy charade inscrutability secrecy inscrutableness complexity rebus occult complication rune labyrinth braintwister unknown sixty-four-thousand-dollar question facer thriller oracle chiller whodunit subtlety cruncher maze difficult question vexed question obscurity mindboggler knotty problem tickler ambiguity uncertainty crossword jigsaw toughie key awkward problem gateway abstrusity roun tough one quiz imponderable fix involvement snarl how-do-you-do inextricability uphill obfuscation hard nut to crack stinker example illustration bugaboo query inexplicableness mystique sixty-four thousand dollar question cliff-hanger can of worms koan entanglement distraction brain-twister embarrassment doubt strait predicament confusion plight Chinese puzzle knotty question tough proposition magic convolution complicacy tangle web chaos imbroglio trickiness complexness complicatedness knottiness mess morass net muddle mesh disarray twist mire skein jungle tortuousness convolutedness turn difficult proposition depth mysteriousness profundity incomprehensibility esotericism vagueness jumble mishmash hash medley assortment clutter mixture sophistication collage agglomeration miscellany patchwork hodgepodge variety mélange smorgasbord network potpourri reconditeness arcaneness deepness occultness motley montage miscellanea hardness intricateness motley collection mixed bag bundle mass patchwork quilt mash-up weave awkwardness difficultness elaborateness involution involvedness

Trái nghĩa của a closed book

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