In a blurry or unclear manner; without sharp focus or distinct details.
From 'blurry' (adjective meaning unclear or out of focus) plus the adverbial suffix '-ly,' which transforms adjectives into adverbs describing how an action occurs.
The word 'blur' itself is relatively young in English (1600s), but it's so intuitive that we immediately understand its adverbial form. It shows how modern, onomatopoetic words move through word-class systems the same way ancient Latin roots do.
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