All of a sudden, abruptly, and all at once are all synonyms for suddenly. Gradually and slowly are antonyms of suddenly. And here are 22 another word for suddenly.
Abruptly, all at once, all of a sudden, at once, immediately, in a flash, in a trice, in an instant, instantaneously, instantly, like a shot, on the spur of the moment, out of the blue, promptly, straight away, straight off, swiftly, unexpectedly, without notice, without warning, and before you can say knife are all synonyms for suddenly.
Suddenly synonym page has a variety of synonyms that differ in length. 1 synonym with 6, 7, 13, 14, 15, and 20 letters and 4 synonyms with 8, and 12 letters. 3 synonyms with 9, and 11 letters. For a total of 20 another word for suddenly.
Suddenly, the lights went out.
She suddenly remembered the appointment.
The dog barked suddenly at strangers.
Suddenly, it started to rain.