Synonyms of 'enigma'

confidence, why, Z, x, upset, terra incognita, teaser, stumper, sticker, stew, secret, scrape, riddle, question mark, question, quandary, puzzler, puzzlement, puzzle, problem, privity, privileged communication, predicament, pother, poser, plight, pickle, perturbation, perplexity, paradox, oxymoron, nonplus, nodus, node, N, mystery, knot, jigsaw puzzle, jam, Gordian knot, frontier, floorer, fix, esoterica, embarrassment, disturbance, disconcertedness, disconcert, discomposure, dilemma, dark horse, Crux, conundrum, confusion, Chinese puzzle, cabala, bother, bewilderment, baffle, arcanum