noun🔗ShareThe quality of being hard."The hardness of the diamond makes it ideal for cutting glass. "qualitymaterialChat with AIVocabulary GamePractice Reading
noun🔗ShareAn instance of this quality; hardship."The recent loss of her job added another layer of hardness to her already difficult life. "qualityconditionsufferingChat with AIVocabulary GamePractice Reading
noun🔗ShareThe quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm)."The water softener increased the hardness of the tap water, making it easier to wash dishes. "chemistrysubstanceenvironmentgeologyChat with AIVocabulary GamePractice Reading
noun🔗ShareThe resistance to scratching, cutting, indentation or abrasion of a metal or other solid material."The diamond's exceptional hardness makes it ideal for cutting glass. "materialqualitytechnicalscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareThe penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation."The hardness of the X-rays used in the dentist's office allows them to pass through your teeth and show the dentist any problems. "physicsenergytechnologyscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareThe measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack."The military base's hardness was tested against simulated bombing runs to assess its ability to withstand an actual attack. "militarytechnologybuildingwarChat with AIVocabulary GamePractice Reading
