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

Minerals like calcium and magnesium can cling to the surface over time, especially in areas with high water hardness. —Daley Quinn, Southern Living, 4 Oct. 2024

In contrast, conventional 316L stainless steel typically exhibits a surface hardness of around 220 HV. —Bhanu Chopra, Forbes, 4 Sep. 2024

According to Ian Stribling, general manager at Goldie, the city's place on the ranking was especially due to a high UV index and water hardness. —Laura Daniella Sepulveda, The Arizona Republic, 19 Sep. 2024

Courage to all my butterflies in defending softness, tenderness, magic, and sweetness in a world full of hardness. —Madison Bloom, Pitchfork, 13 Sep. 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