Blurriness means when something is not clear or sharp, like when you can't see an image or words sharply. It's like looking through a foggy window or having trouble focusing your eyes. Full definition
The game looks pretty much the same as all of the other versions, down to the intentional blurriness of the camera view vs your eyesight to the detail of your treaded footprints after you step through pools of blood. (reviews2go.com)
Diffraction also causes unavoidable blurriness in telescopes, as light waves bend around the secondary mirror used to direct and focus the image. (discovermagazine.com)
Photos also has a slew of fixes, including for blurriness and Live Photo playback. (imore.com)