1. 即席,临时作成的：extant 现存的 | extemporaneous 即席,临时作成的 | extemporize 即席演说,即席作曲

2. 临时的：extemporal 无准备的 | extemporaneous 临时的 | extemporarily 即席地

3. 911查询·英语单词

3. 即兴的,临时的：extemporize即兴发言创作演奏演说 | extemporaneous即兴的,临时的 | tempo速度,拍子

4. 无准备的,即席的,临时的：extemporization 即席作成,即席演说,即兴之作 | extemporaneous 无准备的,即席的,临时的 | extemporary 即席的,即兴性的

1. with little or no preparation or forethought

    e.g. his ad-lib comments showed poor judgment
           an extemporaneous piano recital
           an extemporary lecture
           an extempore skit
           an impromptu speech
           offhand excuses
           trying to sound offhanded and reassuring
           an off-the-cuff toast
           a few unrehearsed comments

    Synonym: ad-libextemporaryextemporeimpromptuoffhandoffhandedoff-the-cuffunrehearsed