impediment, hurdle, stumbling block, hindrance, roadblock, challenge, drawback, pitfall, prerequisite, problem, bottleneck, hinderance, constraint, barrier, factor, difficulty, bugbear, irritant, conundrum, stepping stone, complication, threat, headache, dilemma, bugaboo, shortcoming, obstructions, determinant, chore, motivator, precondition, impossibility, distraction, danger, determiner, element, quandary, sine qua non, disadvantage, task, headwind, minefield, misconception, steppingstone, disincentive, hitches, setback, kink, accomplishment, thing, thorn, issue, overhang, nemesis, component, hazard, attraction, litmus test, concern, bane, imponderable, step, adversary, boon, facet, downsides, reason, encumbrance, aspect, plank, linchpin, avenue, snags, path, achilles heel, manifestation, objection, hassle, gauntlet, panacea, necessity, hot potato, hump, question, puzzle, paradox, possibility, nightmare, annoyance, way, hamper, stressor, contradiction, logjam, course, milestone, chokepoint, limitation, priority, wrinkle, breaker, requirement, obstacles, handicap, flaw, downside, impediments, hindrances, drawbacks, pusillanimous, challenging, dastardly, dishonourable, erratic, innovatory, mad, sinful, suggested, toughest, unsteady, uphill, abstemious, actual, adventurous, advocated, aimless, akratic, announced, anticipatory

hang-up, hitch, rub, snag, stymie

., bridge, bump into, butt against, cheval-de-frise, chevaux-de-frise, concertina, distraction, hang-up, hazard, hinder, hitch, hurdle, impede, interfere, jar against, knock against, move around, overleap, remove, rub, run into, sheer, snag, span, stumbling block, trou-de-loup, vault

deterrent, impedimenta, obstruction