IPA: /ˈblɜːrɪnəs/
KK: /ˈblɜrɪnəs/
The quality or state of being unclear or not sharp in appearance.
The blurriness of the photo made it hard to see the details.
Blurriness is formed from "blur" (of uncertain origin, possibly from Middle English "blurren", meaning to make dim or indistinct) and the suffix "-iness" (meaning the quality of). The word "blurriness" refers to the quality of being unclear or indistinct.
Think of the word 'blur' which means to make something unclear, and the suffix '-iness' indicates a quality. So, blurriness is the quality of being unclear.