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Noun hardness has 4 senses
- hardness - the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
--1 is a kind of consistency, consistence, body
--1 has particulars: firmness; incompressibility
- unfeelingness, callousness, hardness, insensibility - devoid of passion or feeling
--2 is a kind of insensitivity, insensitiveness
- hardness - the quality of being difficult to do; "he assigned a series of problems of increasing hardness"
--3 is a kind of difficulty, difficultness
- severity, harshness, rigor, rigour, inclemency, hardness, stiffness - excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
--4 is a kind of sternness, strictness