unrehearsed

This method allows for naturalness and unrehearsed sounding speeches without losing any of the important points which must be covered.

这种方法考虑到未经预演的演讲没有失去其涉及到的重要观点。

I won't tell you any more, so you can imagine it, so you can have it unrehearsed when the time comes, as it will, as it does come.

我不能再多说了，你可以去想象，当那一时刻到来的时候，你将会有全新的感受，那一定会到来的。

It is worth analyzing this comment, because it was no unrehearsed line.

有必要分析一下普京的评论，因为它是普京未经思索、脱口而出的话。

The actors gave passableperformances but the singers seemed unrehearsed.

演员们的表演还过得去，但歌手们似乎未经过训练。

eg. The show was unrehearsed. The actors just winged it.

那场戏没有预演过，演员就即席演出。