durity means hardness; firmness.
Etymology
From Latin duritas, from durus (“hard”).
noun
- hardness; firmness“it cometh short of their compactness and durity; and, therefore, requireth not the emery, as the saphire, granite, and topaz, but will receive impression from steel, in a manner like the turquoise.”
- harshness; cruelty“[…]surrendred to the said John by the said William by durity and menaces”