impromptu

即興的、臨時的、即席的

We had an impromptu party in the office after the good news.

聽到好消息後，我們在辦公室臨時辦了一場慶祝會。

即興地、臨時地

She spoke impromptu for ten minutes and still sounded convincing.

她即興講了十分鐘，聽起來依然很有說服力。

即興曲音樂

The pianist ended the recital with a short impromptu.

鋼琴家以一首短小的即興曲結束了獨奏會。

即席演出、即興之作

His opening remarks were a clever impromptu, not a prepared speech.

他的開場白是巧妙的即席發揮，並非事先寫好的講稿。