An extemporaneous speech or remark
English: impromptu
impromptuEnglish
impromptu, ad-lib, ad lib, ad libitum, extemporaneous
Noun
A short musical passage that seems to have been made spontaneously without advance preparation
English: impromptu
Adjective
With little or no preparation or forethought
English: ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
Adverb
Without advance preparation
English: ad lib, ad libitum, spontaneously, impromptu