ad-lib

名词 ad-lib:

1. remark made spontaneously without prior preparation

动词 ad-lib:

1. perform without preparation
   同义词：improvise, improvize, extemporize, extemporise

形容词 ad-lib:

1. said or done without having been planned or written in advance
   同义词：spontaneous, unwritten
2. with little or no preparation or forethought
   同义词：extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed

副词 ad-lib:

1. without advance preparation
   同义词：ad lib, ad libitum, spontaneously, impromptu