Texture:
* Hardness: This is the most straightforward opposite. Think of a rock versus a feather.
* Roughness: This is a less extreme opposite. Think of sandpaper versus velvet.
* Brittleness: This refers to the tendency to break easily. Think of a piece of glass versus a sponge.
Sound:
* Loudness: Soft sounds are quiet.
* Sharpness: Soft sounds are often described as gentle or muffled.
Light:
* Brightness: Soft light is dim.
Emotion:
* Harshness: Softness can also refer to a gentle, kind, or compassionate nature. The opposite of this could be harshness, cruelty, or ruthlessness.
Other:
* Strength: Softness can sometimes be associated with weakness, so strength could be considered an opposite.
To give you a more accurate answer, tell me what context you're thinking of when you ask about the opposite of softness!