名词

1. 最低点;最不幸的时刻
The nadir of something such as someone's career or the history of an organization is its worst time.

2. 天底
In astronomy, the nadir is the point at which the sun or moon is directly below you, on the other side of the earth.

1. the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected

2. an extreme state of adversity
the lowest point of anything

Synonym: low-water mark