obstacle
noun
ob·sta·cle
ˈäb-sti-kəl
-ˌsti-
: something that impedes progress or achievement
Mosquitoes were a great obstacle to the building of the Panama Canal.
… elders … often facing daily medical, social, and psychological obstacles.—Vicki Bloom and B. B. Green-Field
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Merriam-Webster unabridged
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