1. (noun) hardness
the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
Synonyms: harshness, rigour, callousness, callosity, severeness, severity, unfeelingness, rigourousness, inclemency, rigorousness, ruggedness, rigor, stiffness, insensibility
Antonyms: softness
2. (noun) hardness
a quality of water that contains dissolved mineral salts that prevent soap from lathering
Synonyms: harshness, rigour, callousness, callosity, severeness, severity, unfeelingness, rigourousness, inclemency, rigorousness, ruggedness, rigor, stiffness, insensibility
Antonyms: softness
3. (noun) unfeelingness, callousness, callosity, hardness, insensibility
devoid of passion or feeling; hardheartedness
Synonyms: harshness, rigour, callousness, callosity, severeness, severity, hardness, unfeelingness, rigourousness, inclemency, rigorousness, insensibility, ruggedness, rigor, stiffness, callus
Antonyms: softness
4. (noun) hardness, ruggedness
the quality of being difficult to do
Synonyms: ruggedness, callosity, severeness, huskiness, rigor, unfeelingness, rigourousness, hardness, stiffness, harshness, inclemency, toughness, rigorousness, callousness, severity, insensibility, rigour
Antonyms: softness
5. (noun) severity, severeness, harshness, rigor, rigour, rigorousness, rigourousness, inclemency, hardness, stiffness
excessive sternness
Synonyms: insensibility, ruggedness, callosity, grimness, awkwardness, severeness, rigor, unfeelingness, austereness, harshness, hardness, asperity, stiffness, callousness, scratchiness, roughness, cogency, gracelessness, inclemency, inclementness, badness, bad weather, hardship, rigorousness, cruelty, cruelness, clumsiness, abrasiveness, severity, rigourousness, rigour, validity
Antonyms: softness
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Synonyms for hardness 
