With little or no preparation or forethought. Synonyms:extemporaneous, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded, unrehearsed."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"
2.
Said or done without having been planned or written in advance. Synonyms:spontaneous, unwritten.
