dazzlingly

US /ˈdæz.əl.ɪŋ.li/
UK /ˈdæz.əl.ɪŋ.li/
1.

rực rỡ

If a light is dazzlingly bright, it is so bright that you cannot see for a short time after looking at it:

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By about ten in the morning the sun was already dazzlingly bright.