Precarious (adjective)

1. Uncertain and dependent on chance or on the will of others.
2. Not securely held or in danger of falling or collapsing.

Origin:

From the latin word "precarius" meaning uncertain, dependent on the will of another.

Examples:

1. The climbers were in a precarious position on the narrow ledge.
2. His job as a freelance consultant is precarious, as he never knows when his next job will come.
3. The company's financial situation is precarious.
4. The bridge was in a precarious state and had to be closed.
5. The political situation in the country is precarious, with tensions rising between different factions.