Definition of Hardness

1. Noun. The property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale.

Generic synonyms: Body, Consistence, Consistency, Eubstance
Specialized synonyms: Firmness, Incompressibility
Attributes: Hard, Soft
Derivative terms: Hard
Antonyms: Softness

2. Noun. A quality of water that contains dissolved mineral salts that prevent soap from lathering. "The costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present"
Generic synonyms: Quality

3. Noun. Devoid of passion or feeling; hardheartedness.
Exact synonyms: Callosity, Callousness, Insensibility, Unfeelingness
Generic synonyms: Insensitiveness, Insensitivity
Specialized synonyms: Dullness
Derivative terms: Callous, Callous, Hard, Insensible, Unfeeling

4. Noun. The quality of being difficult to do. "The ruggedness of his exams caused half the class to fail"
Exact synonyms: Ruggedness
Generic synonyms: Difficultness, Difficulty
Derivative terms: Hard, Hard, Rugged

5. Noun. Excessive sternness. "The rigors of boot camp"

Definition of Hardness

1. n. The quality or state of being hard, literally or figuratively.

Definition of Hardness

1. Noun. The quality of being hard. ¹

2. Noun. An instance of this quality; hardship. ¹

¹ Source:

Definition of Hardness

1. the state of being hard [n -ES]

Medical Definition of Hardness

1. Total concentration of calcium and magnesium ions, expressed as the equivalent concentration (mg/L) of calcium carbonate. Hard water is water that contains lots of calcium carbonate and other minerals. (09 Oct 1997)

Hardness Pictures

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Lexicographical Neighbors of Hardness

hardly a(a)
hardness (current term)
hardness scale

Literary usage of Hardness

Below you will find example usage of this term as found in modern and/or classical literature:

1. Standard Methods of Chemical Analysis: A Manual of Analytical Methods and by Wilfred Welday Scott (1922)
"hardness Total hardness The most accurate method for total hardness is by calculation of the calcium and magnesium determined ..."

2. Methods of Practical Hygiene by Karl Bernhard Lehmann (1893)
"Clark's Determination of hardness. § 191. Water which contains considerable quantities of the two alkaline earths above-named can be recognised by many ..."

3. Journal of the American Chemical Society by American Chemical Society (1891)
"The objects in view, in the ordinary course of analysis, when hardness is determined, are as follows : 1st. Simply to place the water i|i the category of ..."

4. A Text-book of Mineralogy: With an Extended Treatise on Crystallography and by Edward Salisbury Dana, James Dwight Dana (1877)
"Accurate determinations of the hardness of minerals have been made by ... By means of such an instrument the hardness of the different faces of a given ..."

5. Manual of Mineralogy: Including Observations on Mines, Rocks, Reduction of by James Dwight Dana (1876)
"hardness. The comparative hardness of minerals is easily ascertained, and should be the first character attended to by the student in examining a specimen. ..."

6. Biennial report by North Dakota Geological Survey (1906)
"hardness.—Clay is generally soft and easily scratched with the finger nail, the hardness depending on its chemical composition, moisture and compactness. ..."

7. The Encyclopædia Britannica: A Dictionary of Arts, Sciences, Literature and by Hugh Chisholm (1910)
"A high degree of hardness is an essential property of a gem- stone,, for however beautiful and brilliant a mineral may be it is hardness use*ess to lnc ..."

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