Main entry: rigor, rigorousness, rigour, rigourousness, severeness, severity, inclemency, hardness, harshness, stiffness
Definition: excessive sternness
Usage: severity of character; the harshness of his punishment was inhuman; the rigors of boot camp
Main entry: hardness, ruggedness
Definition: the quality of being difficult to do
Usage: he assigned a series of problems of increasing hardness; the ruggedness of his exams caused half the class to fail
Main entry: unfeelingness, insensibility, hardness, callosity, callousness
Definition: devoid of passion or feeling; hardheartedness
Main entry: hardness
Definition: a quality of water that contains dissolved mineral salts that prevent soap from lathering
Usage: the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present
Main entry: hardness
Definition: the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale