bottomless pit

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noun

hell(def 1).
something that drains all one's energy or resources.

Origin of bottomless pit

First recorded in 1525–35

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for bottomless pit

hell, abyss, chasm, crevasse, gulf, abysm, Hades