1. ad-lib, extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded, unrehearsed

with little or no preparation or forethought

Example Sentences:
'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'

Synonyms

• ad-lib
• extemporaneous
• extempore
• impromptu
• off-the-cuff
• offhand
• offhanded
• unrehearsed