hardness

noun

hard·​ness ˈhärd-nəs 

1

: the quality or state of being hard

2

a

: the cohesion of the particles on the surface of a mineral as determined by its capacity to scratch another or be itself scratched compare mohs' scale

b

: resistance of metal to indentation under a static load or to scratching

Synonyms

• adversity
• asperity
• difficulty
• hardship
• rigor

Examples of hardness in a Sentence

the hardness of a diamond

The wood's hardness makes it suitable for carving.

Recent Examples on the Web

For all its ugliness, hardness is seductive, as is a toxic, dominating man’s pull. —Naomi Fry, The New Yorker, 30 Sep. 2024

Water hardness is created by minerals such as calcium carbonate. —Emiliano Tahui Gómez, Austin American-Statesman, 15 July 2024

Some small clinical trials have shown biotin supplements may help strengthen brittle nails by improving their firmness, thickness and hardness. —Caroline C. Boyle, USA TODAY, 20 Nov. 2024

These types of steel may have differing levels of carbon content, or different levels of hardness. —Andrew Williams, Forbes, 25 Oct. 2024

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1

Phrases Containing hardness

• Brinell hardness
• Brinell hardness number

Kids Definition

hardness

noun

hard·​ness ˈhärd-nəs 

1

: the quality or state of being hard

2

: the ability of a substance (as a mineral) to scratch another substance or be itself scratched