Suddenly
Synonyms: Immediately, instantly, straight away, at once, promptly, in a trice, unexpectedly, without notice, straight off, in a flash, before you can say knife, instantaneously, in an instant, all of a sudden, all at once, abruptly, swiftly, without warning, on the spur of the moment, out of the blue, and like a shot.
Example Sentences
Suddenly, the lights went out.
She suddenly remembered the appointment.
The dog barked suddenly at strangers.
Suddenly, it started to rain.