1. (n.) An obscure or inexplicable saying; a riddle; something the hidden meaning of which is to be discovered or guessed\.

2. (n.) An action, mode of action, or thing, which cannot be satisfactorily explained; a puzzle; as, his conduct is an enigma.

Chinese puzzle Gordian knot arcanum baffle bafflement baffling problem bewilderment bother brain twister cabala classified information confidence confidential communication confoundment confusion conundrum crossword puzzle crux dark horse dilemma discomposure disconcert disconcertedness disconcertion disconcertment disturbance embarrassment enigmatic question esoterica fix floorer frontier frontiers of knowledge guarded secret hermetics jam jigsaw puzzle knot knotty point matter of ignorance mind-boggler mystery mystery of mysteries mystification n node nodus nonplus nut to crack oxymoron paradox perplexed question perplexity personal matter perturbation pickle plight pons asinorum poser pother predicament private matter privileged communication privity problem profound secret puzzle puzzlement puzzler quandary question question mark restricted information riddle scrape sealed book secret sixty-four dollar question stew sticker stumper teaser terra incognita the incalculable the occult the strange the unfamiliar the unknowable the unknown tough proposition unassuredness unexplored ground unexplored territory unknown quantity upset vexed question why x z