Hardness

n.	1.	The quality or state of being hard, literally or figuratively. The habit of authority also had given his manners some peremptory hardness. - Sir W. Scott.
	2.	(Min.) The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched; - measured among minerals on a scale of which diamond and talc form the extremes.
	3.	(Chem.) The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes.

Noun	1.	hardness - the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale Antonyms: softness - the property of giving little resistance to pressure
	2.	hardness - devoid of passion or feeling Synonyms: callousness, unfeelingness, insensibility
	3.	hardness - the quality of being difficult to do; "he assigned a series of problems of increasing hardness"
	4.	hardness - excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp" Synonyms: inclemency, rigor, rigour, severity, stiffness, harshness

Philistinism, abstruseness, arduousness, armor, asperity, astringency, austerity, bothersomeness, burdensomeness, callosity, callousness, callus, closeness, cohesiveness, coldbloodedness, coldheartedness, coldness, compactness, complexity, complication, congestedness, congestion, consistence, consistency, crabbedness, crampedness, crowdedness, cruelty, deepness, denseness, density, difficultness, difficulty, durability, esoterica, firmness, flintiness, formidable defenses, fundamentalism, gluiness, grimness, hairiness, hard heart, hard shell, hardenedness, hardheartedness, hardiness, hardness of heart, hardship, harshness, heart of stone, heartlessness, impenetrability, impenitence, impenitentness, impermeability, imperviousness, impliability, imporosity, inclemency, incompressibility, induration, inexorability, inexorableness, inflexibility, infrangibility, insensitiveness, insensitivity, insolence, intricacy, inuredness, irrepentance, jammedness, knottiness, laboriousness, lastingness, leatherlikeness, mercilessness, nonrepentance, obduracy, obdurateness, obstinacy, onerousness, oppressiveness, orthodoxy, pitilessness, precisianism, profoundness, profundity, purism, puritanism, reconditeness, relative density, relentlessness, remorselessness, resistance, rhinoceros hide, rigidity, rigidness, rigor, rigorousness, ropiness, roughness, ruggedness, ruthlessness, seared conscience, severity, short shrift, solidity, solidness, soundness, specific gravity, spissitude, stability, stamina, staunchness, sternness, stiffness, stoniness, stoutness, strength, strenuousness, stringency, stringiness, stubbornness, sturdiness, temper, tenacity, tender mercies, thick skin, thickness, toilsomeness, toughness, troublesomeness, unabjectness, unbendingness, unbreakability, unbreakableness, uncompassionateness, uncompromisingness, uncontriteness, unfeeling, unfeelingness, unforgivingness, ungentleness, unmercifulness, unnaturalness, unrelentingness, unremorsefulness, unresponsiveness, unsympatheticness, unyieldingness, vicissitude, vigor, viscidity, viscosity, viscousness, vitality