sudden
US /ˈsʌd.ən/
UK /ˈsʌd.ən/

1.
soudain, brusque
occurring or done quickly and unexpectedly or without warning
:
•
There was a sudden change in the weather.
Il y a eu un changement soudain de temps.
•
He made a sudden decision to quit his job.
Il a pris une décision soudaine de quitter son emploi.