hardness Synonyms

severity severeness rigourousness rigour rigorousness inclemency unfeelingness insensibility rigor stiffness harshness callousness ruggedness callosity specific gravity substantiality toughness relative density soundness viscidity viscosity stringiness stringency spissitude squashiness stableness sternness sturdiness stoniness strength strictness fundamentalism oppressiveness abrasiveness emotionlessness esoterica runniness burdensomeness onerousness despotism insensitiveness hardheartedness mercilessness cumbersomeness scratchiness heartlessness ph ruthlessness relentlessness pitilessness