Anything that gets in your way. A personal obstacle could be (for a job interview) trying too hard, or focusing too much time on one activity while others suffer, it could be time management, just something that gets in your way.
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obstacle of reading
her largest obstacle
Obstacle is correct.
that test was as difficult as n obstacle
No, it is an article (indefinite article), which is a form of "determiner" that determines if a noun is a specific example or any one of the examples. "An" obstacle = any obstacle "The" obstacle = a certain obstacle
That obstacle is in my way!
Verrazannos biggest obstacle is
Octavian was Cleopatra's biggest obstacle.
every body had to face an obstacle in there life
The Tagalog word for "obstacle" is "hadlang".
Yes, obstacle is a noun. It refers to something that blocks or hinders progress or movement.