1Happening abruptly, without warning; sudden and unexpected. Used as-is adverbially, or attributively as '突然の'.
突然の雨でピクニックは中止になった。
The picnic was canceled due to a sudden rain shower.
彼は会議の途中で突然辞表を出した。
He suddenly submitted his resignation in the middle of the meeting.
話が突然変わって驚いた。
I was surprised when the topic suddenly changed.
突然の別れに、彼女は涙が止まらなかった。
Faced with the sudden parting, she couldn't stop crying.