noun
the property of being rigid and resistant to pressure
Examples
- not easily scratched
- measured on Mohs scale
noun
a quality of water that contains dissolved mineral salts that prevent soap from lathering
Examples
- the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present
noun
devoid of passion or feeling
Synonyms
Examples
- hardheartedness
noun
the quality of being difficult to do
Synonyms
Examples
- he assigned a series of problems of increasing hardness
- the ruggedness of his exams caused half the class to fail
noun
excessive sternness
Synonyms
Examples
- severity of character
- the harshness of his punishment was inhuman
- the rigors of boot camp