extemporaneous
英 [ɪk,stempə'reɪnɪəs; ek-]
美 
	    - adj. 即席的,临时的;无准备的;不用讲稿的;善于即席讲话的
 
英英释意
- 1. with little or no preparation or forethought;
 - "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"