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An extemporaneous speech, answer, or performance is one you make without a finished script. You may know the subject, and you may have had a few minutes to think, but the actual words come out in the moment. Teachers, debate coaches, and formal writing like this word; friends would just say you made it up as you went, or you improvised. Though actually, it is not the same as having no idea at all. A good extemporaneous speaker often knows the topic well and only skips the prepared text. In some American speech contests, the word even has a slightly special use: you draw a topic, get a short time to prepare, then speak without reading. It is a formal adjective. The everyday twins are impromptu and off the cuff, which feel looser and less classroom-like.
即席的、即興的（學校「即席演講」就是這個）
組成From Late Latin extemporāneus, from Latin ex tempore (“impromptu”, literally “out of the moment”).
同家族的字
- extemporesame Latin phrase ex tempore, “out of the moment”
- extemporizethe verb built on that same base
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
extemporaneousadj/ɪksˌ-/
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With inadequate preparation or without advance thought; offhand.
- My speeches in Great Britain were wholly extemporaneous, and I may not always have been so guarded in my expressions, as I otherwise should have been. I was ten years younger then than now, and only seven years from slavery.
- “Who the devil is there in Ramilly County,” muttered Amory aloud, “who would deliver Verlaine in an extemporaneous tune to a soaking haystack?”
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。