off-hand

adj.不客气的；未经准备的

I cannot give you a reply off hand. 我不能立刻给你答复。

We cannot give you a reply off hand. 我们不能马上给你回音。

Being an expert, he was able to pick a hole in our work off hand. 作为一名专家，他一下子就能挑出我们工作中的毛病。

I sent many letters today. Off hand, I should think15. 今天我寄出许多信。大致地算，我想有15封吧。

I can't answer your question off hand. 我不能立即答复你的问题。

I'm talking off hand, simply speaking my mind. 我这是信口开河， 随便谈谈脑子里想的东西。