Shocked like a bolt from the blue?

Usage examples of thunderstricken.

Then noticing that the tips of her ears were rather dirty, she rang at once for warm water, and washed her, changed her linen, her stockings, her shoes, asked a thousand questions about her health, as if on the return from a long journey, and finally, kissing her again and crying a little, she gave her back to the servant, who stood quite thunderstricken at this excess of tenderness.

When I reflected that this marvellous electric agent, after having afforded motion, heat, and light to the Nautilus, still protected her from outward attack, and transformed her into an ark of safety which no profane hand might touch without being thunderstricken, my admiration was unbounded, and from the structure it extended to the engineer who had called it into existence.