Frighteningly

Paul heard a frighteningly loud bang on the door.

The oddly assorted creatures, some humanoid in form, some frighteningly animalistic, formed a rough guard about Rocky and Bud.

In India's large cities, the air's particulate matter content is frighteningly high.

The pitcher that was set before me was frighteningly large.

Risk is everywhere.[…]For each [kind] there is a frighteningly precise measurement of just how likely it is to jump from the shadows and get you. “The Norm Chronicles”[…]aims to help data-phobes find their way through this blizzard of risks.