|1.||[ noun ] the quality of being difficult to do|
"he assigned a series of problems of increasing hardness"
|2.||[ noun ] devoid of passion or feeling|
|Synonyms:||callousness insensibility unfeelingness|
|3.||[ noun ] the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale|
|Related terms:||softness consistency firmness incompressibility soft hard|
|4.||[ noun ] excessive sternness|
|Synonyms:||harshness inclemency stiffness rigor rigour severity|
"severity of character" "the harshness of his punishment was inhuman" "the rigors of boot camp"