This is the 1191st most frequent Japanese word.
突然
Suddenly; abruptly.
The word "突然" is used as an adverb to indicate an abrupt change in the state of the room or the atmosphere.
突然、部屋が静かになった。
Suddenly, the room became silent.
In this sentence, "突然" modifies the noun "提案" to describe the unexpected nature of the proposal.
彼の突然の提案に驚いた。
I was surprised by his sudden proposal.
Here, "突然" is used to describe the manner in which the resolution occurred, emphasizing the immediate and unforeseen nature of the action.