off the cuff

形容词 off the cuff:

1. with little or no preparation or forethought
   同义词：ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed

副词 off the cuff:

1. without preparation

1. I won't prepare a speech: I'll talk off the cuff.
   我不准备发言稿，我将即兴发言。