instantaneously
outright
instantly **
in a flash

The idea came to him in a flash, and he couldn't stop himself.

She would be gone in a flash of light, taken.

Then he brought us here in a flash of light.

In a flash she'll be on the phone to the police.

We set up again and he came at me in a flash.

The whole history of the man came back to me in a flash.

And then in a flash they were no longer any such thing.

She'll take your money in a flash if you break up with her.

The game was far from played out, and everything could still turn against her in a flash.

My eyes came open and in a flash, I knew.