IPA: /ˈblɜːrɪŋli/
KK: /ˈblɜrɪŋli/
In a way that makes something unclear or indistinct.
The vision was blurringly unclear after the bright flash of light.
Blurringly is formed from "blur" (of uncertain origin, possibly from Middle English "blurren", meaning to make indistinct) and "-ingly" (a suffix used to form adverbs indicating manner). The word describes an action done in a manner that causes indistinctness or lack of clarity.
Think of the word 'blur' which means to make something unclear, and remember that 'blurringly' describes doing something in a way that makes it unclear.