nadir

noun

na·​dir ˈnā-ˌdir  ˈnā-dər 

1

: the point of the celestial sphere that is directly opposite the zenith and vertically downward from the observer

2

: the lowest point

Illustration of nadir

• 1 nadir
• 2 observer
• 3 zenith

Did you know?

Nadir Has Arabic Roots

Nadir is part of the galaxy of scientific words that have come to us from Arabic, a language that has made important contributions to the English lexicon especially in the fields of mathematics, astronomy, medicine, and chemistry. The source of nadir is naḍhīr, meaning “opposite”—the opposite, that is, of the zenith, the highest point of the celestial sphere which is positioned vertically above the observer. (The word zenith itself is a modification of another Arabic word that means “the way over one’s head.”) Though born of the heavens, both words are called upon to refer to earthy things too, especially a significant point or period of time, be it a high point or low one.

Synonyms of nadir

• depth
• zero
• abyss

Examples of nadir in a Sentence

Nantucket reached its nadir in the post-Civil War period. The whaling industry had become moribund, many New Englanders had been lured to California by the discovery of gold, and the island population dropped from ten thousand in 1830 to scarcely more than three thousand in 1880. —David H. Wood, Antiques, August 1995

But then, at the very nadir of that dark abandoned moment, that moment of despair and sickness unto death, … —T. Coraghessan Boyle, The Road to Wellville, 1993

My nadir was the time I presented an oral book report on "Les Misérables," having read only the Classic Comics version … —Stephen Jay Gould, New York Times Book Review, 12 Oct. 1986

The relationship between the two countries reached a nadir in the 1920s.

the discussion really reached its nadir when people resorted to name-calling

Recent Examples on the Web

The Georgia film office has just 12 productions on its website, compared to 14 during the nadir of the 2023 writers and actors strike. — Rodney Ho, AJC.com, 9 July 2026

There were ups and downs leading into the World Cup, with a bit of a nadir last summer with heavy losses to Turkey and Switzerland before the Gold Cup. — Tom Bogert, New York Times, 7 July 2026

Either number would represent a nadir for the former Oregon standout. — Troy Renck, Denver Post, 6 July 2026

That 1992 offense, which stands as the club’s modern offensive nadir, included Wade Boggs and a young Mo Vaughn, but also nobody with more than 15 home runs. — Mac Cerullo, Boston Herald, 14 June 2026

Word History

Etymology

Middle English, from Middle French, from Arabic naḍhīr opposite

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for nadir

• aider
• fader
• grader
• raider
• schrader
• seder
• shader
• trader
• crusader
• invader
• persuader

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Kids Definition

nadir

noun

na·​dir ˈnā-ˌdi(ə)r 

ˈnād-ər

1

: the point of the celestial sphere that is directly opposite the zenith and directly under the observer

2

: the lowest point

our hopes reached their nadir