hardness.
The quality of being hard.
Meaning & usage
The quality of being hard.
An instance of this quality; hardship.
The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
A measure of how hard a material is.
The hardness of the material was high.
Where this word comes from
From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.