Obstacle (noun)

1. Something that blocks one's way or prevents or hinders progress.
2. A problem or difficulty that must be overcome.

Origin:

Late 16th century: from french obstacle, from latin obstaculum "hindrance", from obstare "stand in the way".

Examples:

1. The obstacle in his path to success was a lack of resources.
2. The obstacle course was designed to test the soldiers' physical fitness.
3. The obstacle of language barriers made communication difficult.
4. The obstacle of cultural differences was overcome through mutual understanding.
5. The obstacle to her dreams was her own self-doubt.