hardness Synonyms

callousness severity harshness stiffness firmness rigor severeness rigidity rigour rigorousness resistance inclemency unfeelingness inflexibility rigourousness insensibility durability toughness asperity callosity ruggedness strength strictness solidity compactness density cruelty ruthlessness viscosity stoniness tenacity ph scratchiness abrasiveness oppressiveness substantiality laboriousness viscidity sturdiness stringiness stringency insensitiveness pitilessness relentlessness hardheartedness heartlessness fundamentalism compressive strength relative density specific gravity