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Definitions of hardness:

noun:   the quality of being difficult to do
Example: "He assigned a series of problems of increasing hardness"

noun:   the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
noun:   devoid of passion or feeling
noun:   excessive sternness

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Alternative Terms
fastness firmness security soundness stability stableness steadiness strength sturdiness sureness better-worse change-persist continue-stop-pause austerity harshness rigidity rigour rigorousness severity sternness strictness stringency toughness easy-hard mineral mohs-hardness crystal hardening mohs-scale hard matter solid phase force soft-matter intermolecular-force materials-science operational-definition fracture deformation indentation-hardness elasticity-physics plasticity-physics viscosity viscoelasticity strain-materials-science brittleness-4 ductility rockwell-hardness-scale vickers-hardness-scale brinell-scale sclerometer diamond aggregated-diamond-nanorods beta-carbon-nitride fullerite vickers-tester-png engineering metallurgy janka-wood-hardness-rating knoop-hardness-test united-states shore-durometer particle-size hall-petch-relationship nanoindentation december-4 2005 the-jerusalem-post polyyne acetylene shear-modulus bulk-modulus-2 young-s-modulus anisotropy-3 spall osmium quartz scleroscope stress-strain1-png stress-strain-curve stress-physics stiffness-3 elastic-modulus yield-engineering compressive-strength shear-strength tensile-strength energy ceramics composite-material metal semiconductor vickers-hardness-number facility sclerothrix rockwell-hardness durometer khn bhn

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