abruptly, unexpectedly, rapidly, swiftly, all of a sudden, out of the blue, without warning, quickly, speedily, and precipitously.
a flinch
This could be bolt.
Grasp or seize.
Although it has the actual mean of "sudden", the word is abrupt.
"Suddenly" is an adverb.
A word that means to depart suddenly is "plump" or "plumped"
abruptly, unexpectedly
Abruptly.
a flinch
This could be bolt.
She was driving down the street, but then suddenly, out of nowhere, another car ran a stop light and T-boned her.
Grasp or seize.
Although it has the actual mean of "sudden", the word is abrupt.
"Suddenly" is an adverb.
Sprout would be a word for 'to shoot up suddenly'.
No, "suddenly" is not a compound word. It is an adverb formed from the adjective "sudden."
Another word for "just like that" is "instantly." It conveys the idea of something happening immediately or without delay. Other synonyms include "suddenly" or "promptly," depending on the context.