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nadir

noun [S]
 
 
/ˈneɪ.dɪər/ US  /-dɚ/ formal

Definition

the worst moment, or the moment of least hope and least achievement: The defeat was the nadir of her career. → Compare zenithHigher and lower points of achievementSuccess and achievementsFailures
(Definition of nadir noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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