sudden
US /ˈsʌd.ən/
UK /ˈsʌd.ən/

1.
repentino, súbito
occurring or done quickly and unexpectedly or without warning
:
•
There was a sudden change in the weather.
Hubo un cambio repentino en el clima.
•
He made a sudden decision to quit his job.
Tomó una decisión repentina de dejar su trabajo.