1. the lowest or worst point of something
2. the point on the celestial sphere directly opposite the zenith and directly below the observer
Usage: astronomy

Examples

• The team’s performance reached its nadir during the losing streak.
• After the scandal, his reputation hit its nadir.
• The economy was at its nadir before the recovery began.
• Her confidence was at its nadir after the failed presentation.
• The nadir is the point directly beneath your feet on the celestial sphere.
• Astronomers use the nadir as a reference point for celestial observations.