IPA: /ˈstɪf.nəs/
KK: /ˈstɪf.nəs/
The quality of being rigid or not able to bend easily.
After the workout, I felt a stiffness in my muscles that made it hard to move.
Stiffness → It is formed from "stiff" (from Old English *stif*, meaning rigid or firm) and "-ness" (meaning the state or quality of). The word "stiffness" refers to the quality of being rigid or firm.
Think of the word 'stiff' to remember that 'stiffness' means the quality of being rigid or firm.