Synonyms and related words :
Gordian knot, baffle, bafflement, bewilderment, bother, confoundment, confusion, crux, difficulty, dilemma, discomposure, disconcert, disconcertedness, disconcertion, disconcertment, disturbance, embarrassment, enigma, fix, jam, knot, knotty point, mystery, node, nodus, nonplus, oxymoron, paradox, perplexity, perturbation, pickle, plight, pons asinorum, poser, pother, predicament, problem, puzzle, puzzlement, riddle, scrape, stew, teaser, unassuredness, uncertainty, upset, vexed question