Nadir (noun)

1. The lowest point in the fortunes of a person or organization.
2. The point on the celestial sphere that is directly opposite the zenith and vertically downward from the observer.
3. The point on the celestial sphere that is directly opposite the zenith and vertically downward from the observer.

Origin:

From arabic نظير naẓīr "opposite", from naẓara "to look at, watch".

Examples:

1. The company's stocks hit nadir in the recession.
2. The economy is at its nadir.
3. The nadir is the point on the celestial sphere that is directly opposite the zenith.
4. The nadir is the lowest point in the fortunes of a person or organization.
5. He hit rock bottom, the nadir of his career.