IPA: /ˈsɔːftnəs/
KK: /sɔftnəs/
The quality or state of being gentle, smooth, or not hard.
The softness of the pillow made it very comfortable to sleep on.
Softness → It is formed from "soft" (from Old English *softe*, meaning gentle or yielding) and "-ness" (meaning the state or quality of). The word "softness" refers to the quality of being soft or gentle.
Think of the word 'soft' which means gentle or yielding, and remember that 'softness' describes the quality of being soft.