# hard as the nether millstone

> English word · Adjective

## Definitions
1. Very callous or hardhearted.

## Etymology
A reference to a Biblical passage, Job 41:24.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hard-as-the-nether-millstone