nadir

noun

1. an extreme state of adversity; the lowest point of anything

   Synonyms

   • low-water mark

   Less specific

   • adversity, hardship, hard knocks

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

   Antonym

   • zenith

   Less specific

   • celestial point

   Part of

   • celestial sphere, sphere, empyrean, firmament, heavens, vault of heaven, welkin