sudden

US /ˈsʌd.ən/
UK /ˈsʌd.ən/
"sudden" picture
1.

突然の, 急な

occurring or done quickly and unexpectedly or without warning

:
There was a sudden change in the weather.
天候が突然変わった。
He made a sudden decision to quit his job.
彼は突然仕事を辞める決断をした。