noun

roughness

coarseness, unevenness, harshness, severity

I felt the roughness of the stone wall.

I felt the roughness of the stone wall.

There was a roughness in his voice.

There was a roughness in his voice.

((the ... of sth.)) the quality of being rough I felt the roughness of the stone wall.

Synonyms: coarseness, harshness; Antonyms: smoothness, gentleness

From 'rough' + the noun-forming suffix '-ness', which indicates a state or quality.

It's the noun form of the adjective 'rough'. If a surface is 'rough', it has 'roughness'.

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