obstacle, hindrance, stumbling block, hurdle, hinderance, roadblock, constraint, disincentive, drawback, irritant, prerequisite, problem, factor, bugbear, bottleneck, determinant, precondition, panacea, sine qua non, enabler, encumbrance, consequence, determiner, complication, reason, stepping stone, pitfall, shortcoming, bane, manifestation, challenge, constraining, misconception, barriers, boon, motivator, concern, hamper, justification, detraction, distraction, excuse, headache, detriment, impossibility, element, thorn, issue, catalyst, litmus test, linchpin, proponent, downsides, desideratum, steppingstone, obstructions, difficulties, bugaboo, component, disadvantage, contradiction, threat, facet, achilles heel, repercussion, albatross, necessity, byproduct, ramification, infeasibility, anachronism, determent, silver bullet, conundrum, pipedream, deterrent, limitation, hassle, anathema, avenue, misperception, imperative, predictor, impetus, dampener, criterion, millstone, contributor, affront, objective, lacuna, overhang, danger, objection, paradox, hazard, retarding, per se, symptom, implication, aspect, preoccupation, impediments, obstacles, hindrances, handicap, difficulty, flaw, difference, inducement, downside

albatross, bar, barrier, bind, block, blockade, blockage, closure, encumbrance, hindrance, hitch, incumbrance, interference, millstone, obstacle, obstruction, occlusion, preventative, preventive, stop, stoppage, tumbler

facilitated, facilitative, stumbling block, unobstructed

construction, difficulty, structure

deterrent, handicap, hindrance, impedimenta, obstruction