Insurmountable (adjective)

1. Impossible to overcome or achieve.
2. Impossible to surmount or go beyond.

Origin:

Early 17th century: from in- "not" + surmountable (see surmount).

Examples:

1. The problem seemed insurmountable, but the team worked together to find a solution.
2. The mountain was an insurmountable obstacle for the hikers.
3. The language barrier was an insurmountable challenge for the new immigrants.
4. The debt seemed insurmountable, but the family managed to pay it off through hard work and budgeting.
5. The challenge of living in a remote area of the jungle was an insurmountable problem for the explorers.