noun
(uncountable) The quality of having a rough or uneven surface; roughness, unevenness; (countable, chiefly in the plural) a protruding or rough area or point on a surface; a protrusion.
The quality of being difficult or unpleasant to experience; (countable) a thing that is harsh and difficult to endure; a difficulty, a hardship.
The quality of being harsh or severe in the way one behaves or speaks toward another person; (countable, chiefly in the plural) a deeply hostile or resentful feeling; an animosity, a hatred.
Of sound: gratingness, harshness.
Of taste: harshness or sharpness; acridity, tartness.
Of writing: a lack of elegance and refinement; inelegance, roughness.