Hardness
Devoid of passion or feeling; hardheartedness
Has types
Derivation
Excessive sternness
Derivation
The quality of being difficult to do
Synonyms
Derivation
Examples
He assigned a series of problems of increasing hardness
A quality of water that contains dissolved mineral salts that prevent soap from lathering
Type of
Examples
The costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present
The property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale