suddenness

The suddenness of the storm took everyone by surprise.

I was startled by the suddenness of his outburst.

The suddenness of the decision left us all in shock.

She moved with the suddenness of a cat pouncing on its prey.

The suddenness of the news left him speechless.

The suddenness of the earthquake caused widespread panic.

He was taken aback by the suddenness of her resignation.

The suddenness of his disappearance raised suspicions.

The suddenness of the change in weather caught us off guard.

The suddenness of the applause startled the performer.