Blindingly describes something so intense or extreme that it overwhelms your senses, like staring at a bright light that makes you squint or look away. When sunlight bounces off fresh snow, it can be blindingly bright. When you step outside on a sunny day after watching a movie in a dark theater, the light feels blindingly intense for a moment.

The word often describes more than just literal brightness. Something can be blindingly obvious when it's so clear that missing it seems impossible, like realizing your lost homework was sitting on your desk the whole time. A solution might be blindingly simple when you finally see it, even though you'd been struggling with a problem for an hour.

When something happens blindingly fast, it moves so quickly you can barely process it: a blindingly fast tennis serve, or a sprinter covering ground at a blindingly quick pace. The word captures that sense of being almost overwhelmed by the speed, brightness, or obviousness of something. It's the difference between something being merely bright and something being so bright you have to shield your eyes.