HARDNESS

Definition of HARDNESS

  1. (noun)the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
  2. (noun)a quality of water that contains dissolved mineral salts that prevent soap from lathering
  3. (noun)devoid of passion or feeling; hardheartedness
  4. (noun)the quality of being difficult to do
  5. (noun)excessive sternness