- nadir, low-water mark - an extreme state of adversity; the lowest point of anything
--1 is a kind of adversity, hardship, hard knocks
- nadir - the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
--2 is a kind of celestial point
--2 is a part of
Antonyms: zenithcelestial sphere, sphere, empyrean, firmament, heavens, vault of heaven, welkin