/əksˌtɛmpɚˈeɪni.əs/Scrabble 25Words With Friends 29
Definition
adjective with little or no preparation or forethought.
— synonyms: ad-lib, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
Examples
“"The lovely words of a prepared speech however cannot erase extemporaneous words and deeds — thousands of them — that have run contrary to those aspirations.””