hardness   (Sound)

The noun hardness has 5 senses

• hardness -- (the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale)


• hardness -- (a quality of water that contains dissolved mineral salts that prevent soap from lathering; "the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present")


• unfeelingness, callousness, callosity, hardness, insensibility -- (devoid of passion or feeling; hardheartedness)


• hardness, ruggedness -- (the quality of being difficult to do; "he assigned a series of problems of increasing hardness"; "the ruggedness of his exams caused half the class to fail")


• severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness -- (excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp")