sudden
US /ˈsʌd.ən/
UK /ˈsʌd.ən/

1.
tiba-tiba, mendadak
occurring or done quickly and unexpectedly or without warning
:
•
There was a sudden change in the weather.
Ada perubahan cuaca yang tiba-tiba.
•
He made a sudden decision to quit his job.
Dia membuat keputusan tiba-tiba untuk berhenti dari pekerjaannya.