hardness
UK /ˈhɑːdnəs/ · US /ˈhɑɹdnəs/ noun
Forms hardnesses hardnesse
- noun The quality of being hard.
- noun An instance of this quality; hardship.
- noun (inorganic chemistry) The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).
- noun The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.
- noun (physics) The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.
- noun The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.
- noun (countable, engineering) A measure of how hard a material is. “The hardness of the material was high.”
Synonyms
callosity durity firmness induration inflexibility rigidity renitence renitency stiffness temper unfeelingness callousness insensibility ruggedness severity severeness harshness rigor rigour rigorousness rigourousness inclemency
Antonyms
Etymology
From Middle English hardness, hardnesse, from Old English heardnes, from heard + -nes, equivalent to hard + -ness.
Webster’s 1913
- noun The quality or state of being hard, literally or figuratively.
- noun The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes.
Etymology [AS. heardness.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “hardness”, CC BY-SA 4.0. Details