When the clock strikes, they'll be dumbstruck.

Of course I do! Your friends look positively dumbstruck.

He sits dumbstruck in a room above. I will learn the truth here.

Dumbstruck, the world found itself face to face with the question of its existence and its future.

Dumbstruck police and horrified crowds gathered as an elderly Buddhist monk set fire to himself today, resulting in his death.