suddenness
nounUK /ˈsʌdənnəs/
US /ˈsʌdənnəs/
Suddenness is when something happens very quickly and you did not expect it.
The suddenness of the rainstorm caught everyone at the park by surprise.
OTHER MEANINGS
2. The quality of happening without any warning.
The suddenness of the loud noise made the baby cry.
3. The state of changing from one thing to another very fast.
We were surprised by the suddenness of the weather change.
4. The way something starts or stops all at once.
The suddenness of the car stopping made us all lean forward.