sudden

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

突然的, 忽然的

occurring or done quickly and unexpectedly or without warning

:
There was a sudden change in the weather.
天氣突然變了。
He made a sudden decision to quit his job.
突然決定辭職。