noun

hardness

hardness, difficulty, severity

The hardness of the diamond is well known.

The hardness of the diamond is well known.

He was surprised by the hardness of the exam.

He was surprised by the hardness of the exam.

the hardness of ((sth.)) the quality of being hard The hardness of the rock made it difficult to break.

Synonyms: firmness, rigidity, difficulty; Antonyms: softness, ease

From the adjective 'hard' plus the suffix '-ness', which forms nouns indicating a state or quality.

Think of the quality that a 'hard' object possesses. This quality is its 'hardness'.

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