Synonyms of mystery

1 Syllable
sphinx, why, rune, crux
2 Syllables
thriller, unknowns, stumper, twister, rebus, poser, question, stickler, occult, teaser, chiller, riddle, grabber, problem, riddling
3 Syllables
secretness, cryptogram, conundrums, enigma, whodunit, brainteaser, braintwister, mindboggler, paradox, puzzlement, conundrum, charade, oracle, brain-twister, mind-boggler, secrecy, subtlety, cliffhanger
4 Syllables
perplexity, paradoxes, abstruseness, exoticness, difficulty
5 Syllables
secretiveness, inscrutableness, huggermuggery, mystification
6 Syllables
confidentiality, inscrutability