Part of speech: noun

That which stands in the way of progress; an obstruction; hindrance.

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Usage examples "obstacle":

  1. Nevertheless there were seven of them, and that should be no obstacle. - "Lorna Doone, A Romance of Exmoor", R. D. Blackmore.
  2. For all that, he could not go home yet; the money was still an obstacle. - "The Girl From Keller's Sadie's Conquest", Harold Bindloss.
  3. When in movement it would never stop if some obstacle were not in its road. - "The Moon-Voyage", Jules Verne.