nadir
n
1 point in the heavens directly beneath an observer 天底. Cf 参看 zenith.
2 (fig 比喻) lowest point; time of greatest depression, despair, etc 最低点; 最压抑、 消沉等的时刻
This failure was the nadir of her career. 这次失败是她事业上的低
The parquet floors shone like mirrors; highly polished silver was displayed in gleaming glass cabinets; even my uncle's huge collection of books was kept miraculously free from dust.