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noun

tough nut crack

Main Entry:
enigma [uh-nig-muh]
Part of Speech: noun
Definition: mystery
Synonyms: Gordian knot, bewilderment, cliffhanger, conundrum, crux, cryptogram, grabber, knot*, mind-boggler, mind-twister, mystification, parable, perplexity, problem, puzzle, puzzlement, puzzler, question, question mark, riddle, secret, sixty-four dollar question, sphinx, sticker, stickler, stumper, teaser, tough nut to crack, twister, why*
Main Entry: riddle
Part of Speech: noun
Definition: brain-teaser
Synonyms: bewilderment, brain-twister, charade, closed book, complexity, complication, confusion, conundrum, cryptogram, dilemma, distraction, doubt, embarrassment, enigma, entanglement, intricacy, knotty question, labyrinth, maze, mind-boggler, mystery, mystification, perplexity, plight, poser, predicament, problem, puzzle, puzzlement, quandary, question, rebus, sixty-four dollar question, stickler, strait, stumper, teaser, tough nut to crack, tough proposition, twister
Main Entry: perplexity
Part of Speech: noun
Definition: mystery
Synonyms: abstruseness, brainteaser, braintwister, charade, chiller, cliffhanger, closed book, conundrum, crux, cryptogram, difficulty, enigma, grabber, inscrutability, inscrutableness, mindboggler, mystification, occult, oracle, poser, problem, puzzle, puzzlement, puzzler, question, rebus, riddle, rune, secrecy, sixty-four-thousand-dollar question, sphinx, stickler, stumper, subtlety, teaser, thriller, tough nut to crack, twister, whodunit, why*
Main Entry: puzzler
Part of Speech: noun
Definition: mystery
Synonyms: abstruseness, brainteaser, braintwister, charade, chiller, cliffhanger, closed book, conundrum, crux, cryptogram, difficulty, enigma, grabber, inscrutability, inscrutableness, mindboggler, mystification, occult, oracle, perplexity, poser, problem, puzzle, puzzlement, question, rebus, riddle, rune, secrecy, sixty-four-thousand-dollar question, sphinx, stickler, stumper, subtlety, teaser, thriller, tough nut to crack, twister, whodunit, why*
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