What is another word for "difficulty"?

Roget's Thesaurus (1911) lists these synonyms for "difficulty": anagram, anal, arcanum, being, book, censorious, charade, concealed, confidential, conundrum, crack, crux, dainty, dead, delicacy, delicate, difficult, disdain, enigma, epicure, epicurism, exacting, fastidious, finical, finicky, gift, gourmet, hard, have, horse, house, hypercritical, hypercriticism, ignorance, incognita, intricacy, involved, labyrinth, labyrinthian, labyrinthine.