bar, obstruction, difficulty, hindrance, obstacle, hurdle, fortification, stumbling block, fence, sound or sonic or transonic barrier, restriction, limitation, restraint, impediment, let, drawback, check, preventive, encumbrance, stop, stopper, block, stay, bulwark, barricade, rampart, wall, palisade, picket, roadblock, earthwork, breastwork, outwork, embankment, parapet, blockade, moat, trench, barbed wire, entanglement, pale, limit, boundary, iron curtain, bamboo curtain.
Antonyms way*, passage, opening. See syn. study at impediment.impediment.
