同义词： ad-lib extemporaneous extemporary extempore impromptu offhand offhanded off-the-cuff unrehearsed
以上来源于: WordNet
off the top of one's head
I'm just speaking off the cuff here—I haven't seen the results yet.
我只是在这里即兴说说而已，我还没看到结果呢。
《牛津词典》
I'm not good at speaking off the cuff.
我不擅长即席演讲。
youdao
This isn't the kind of question that one can answer off the cuff. Can I answer it later?
这可不是那种可以随口回答的问题，我可以先不回答吗？
Let's see if I can name a few off the cuff, or without any preparation.
VOA: special.2010.05.02
He even speaks off the cuff, something no candidate is ever supposed to do.
NPR: Thompson, Potential GOP Force, in New Meetings
Which is exactly the point: You do something off the cuff and you just never know.
WSJ: Katherine Rosman on the Joys of Impulse Buying
In any event, Mr Balladur's latest comments were by no means off the cuff.
ECONOMIST: France
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