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Definition of obstacle : That which stands in the way, or opposes; anything that hinders progress; a hindrance; an obstruction, physical or moral.

Synonyms:

impedimenta, prohibition, cramp, help, fetter, obstructer, barricade, shackles, chain, wall, balk, manacle, breastwork, bulwark, open, inconvenience, interference, traverse, parapet, trammel, let, study at impediment, obstructor, bar, holdback, embarrassment, predicament, problem, stumbling block, rampart, hamper

brake, drawback, bung, barrier, frustration, hurdle, bafflement, deterrent, constraint, handicap, snag, impasse, bottleneck, delay, complication, opposition, interruption, restraint, drag, snarl, restriction, resistance, congestion, inhibition, damper, impedance, jam, encumbrance, hindrance, entanglement, constipation, blockade, choke, mire, obstruction, tangle, plug, stoppage, burden, blockage, clog, catch, block, stop, stay, entrapment, disadvantage, crimp, dam, impediment

Usage examples:

• It was a hard, slow push, the square sides of the raft offering every obstacle to progress. - "The Case and The Girl", Randall Parrish.
• But what seemed an obstacle to his future success was the very reverse, for, turning his attention to politics and books, he eventually became one of the leading diplomatists of his day. - "Strange Pages from Family Papers", T. F. Thiselton Dyer.
• I turn the obstacle which I cannot attack in front. - "Cavour", Countess Evelyn Martinengo-Cesaresco.