n.
1.
Arduousness.
2.
Obstacle, impediment, bar, obstruction, barrier, hindrance, trouble, perplexity, exigency, trial, dilemma, embarrassment, emergency, pinch, predicament, fix, pickle, stand, dead-set, set fast, dead-lock, dead-stand, stand-still, horns of a dilemma, up-hill work, sea of troubles, peck of troubles, hard row to hoe, hard nut to crack.
3.
Objection, cavil, obstacle to belief.
4.
Embroilment, complication, controversy, misunderstanding, difference.