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ob·sta·cle

obstacle

pronunciation:
ab st kl
part of speech: noun
definition: that which impedes or prevents forward movement or progress; obstruction.
The obstacle in the train's path turned out to be a cow.The fence proved to be no obstacle for the deer, who easily jumped over it.The road to success is often strewn with obstacles.
synonyms:
bar, barrier, hurdle, impediment, obstruction
antonyms:
advantage, aid, help
similar words:
balk, barricade, block, blockade, check, deterrent, drawback, hindrance, roadblock, rub, snag, stop, stumbling block